ENERGY STAR® Program Requirements
for Computers
Partner Commitments

Following are the terms of the ENERGY STAR Partnership Agreement as it pertains to the manufacture
and labeling of ENERGY STAR certified products. The ENERGY STAR Partner must adhere to thefollowing partner commitments:

Certified Products
1. Comply with current ENERGY STAR Eligibility Criteria, which define performance requirements
and test procedures for Computers. A list of eligible products and their corresponding Eligibility
Criteria can be found at www.energystar.gov/specifications.
2. Prior to associating the ENERGY STAR name or mark with any product, obtain written
certification of ENERGY STAR qualification from a Certification Body recognized by EPA for
Computers. As part of this certification process, products must be tested in a laboratory recognized
by EPA to perform Computer testing. A list of EPA-recognized laboratories and certification bodies
can be found at www.energystar.gov/testingandverification.
3. Ensure that any model associated with the ENERGY STAR name or mark meets the following
standards:
3.1. Product material requirements as defined in restriction of hazardous substances (RoHS)
regulations, as generally accepted. This includes exemptions in force at the date of productmanufacture, where the maximum concentration values tolerated by weight in homogeneousmaterials are: lead (0.1%), mercury (0.1%), cadmium (0.01%), hexavalent chromium (0.1%),
polybrominated biphenyls (PBB) (0.1%), or polybrominated diphenyl ethers (PBDE) (0.1%).
Batteries are exempt.
3.2. The generally accepted attributes of a recyclable product at the date of product manufacture:
where products shall be designed for ease of disassembly and recyclability where external
enclosures, sub-enclosures, chassis and electronic subassemblies are easily removable with
commonly available tools, by hand, or by a recycler's automated processes.
Notes:
The explicit intention is to harmonize with EU RoHS.

For purposes of ENERGY STAR third-party certification, these requirements shall not be reviewed when products are
initially certified nor during subsequent verification testing. Rather, EPA reserves the right to request supporting
documentation at any time.

Using the ENERGY STAR Name and Marks
4. Comply with current ENERGY STAR Identity Guidelines, which define how the ENERGY STAR nameand marks may be used. Partner is responsible for adhering to these guidelines and ensuring that its
authorized representatives, such as advertising agencies, dealers, and distributors, are also incompliance. The ENERGY STAR Identity Guidelines are available at www.energystar.gov/logouse.
5. Use the ENERGY STAR name and marks only in association with certified products. Partner may notrefer to itself as an ENERGY STAR Partner unless at least one product is certified and offered forsale in the U.S. and/or ENERGY STAR partner countries.
6. Provide clear and consistent labeling of ENERGY STAR certified Computers.

ENERGY STAR Program Requirements for Computers – Partner Commitments1

6.1. Partner shall adhere to the following product-specific commitments regarding use of the
ENERGY STAR certification mark on certified products:
6.1.1.Partner must use the ENERGY STAR mark in one of the following ways:
1) Via permanent or temporary label,. All temporary labeling must be affixed to the productwith an adhesive or cling-type application:a. The label shall be on the top or front of the product if the top or front of the producthas a contiguous, coplanar surface area not used for touch input or display that isgreater than or equal to 0.625 in square;b. Otherwise, the label shall be on the reverse side of the screen; or2) Via electronic labeling displayed on the screen such that the ENERGY STAR mark mustbe at least 4% of the screen by area; must be greater than or equal to 76 pixels x 78
pixels; must be legible; must be in cyan, black, or white; and either
a. Must appear at system start-up, and must display for a minimum of 5 seconds; orb. Must appear within the system power settings dialog window. EPA will consider
alternative proposals for electronic labeling on a case-by-case basis.
6.2. Partner must use the ENERGY STAR mark in product literature (i.e., user manuals, spec sheets,etc.).
6.3. Partner must use the ENERGY STAR mark on product packaging for products sold at retail.
6.4. Partner must use the ENERGY STAR mark on the manufacturer’s Internet site where
information about ENERGY STAR certified models is displayed.
6.4.1.If additional information about the ENERGY STAR program or other products is provided by
the Partner on its website, Partner must comply with the ENERGY STAR Web Linking
Policy, which can be found at www.energystar.gov/partners;

Verifying Ongoing Product Qualification
7. Participate in third-party verification testing through a Certification Body recognized by EPA for
Computers, providing full cooperation and timely responses, EPA/DOE may also, at its discretion,
conduct tests on products that are referred to as ENERGY STAR certified. These products may beobtained on the open market, or voluntarily supplied by Partner at the government’s request.

Providing Information to EPA
8. Provide unit shipment data or other market indicators to EPA annually to assist with creation of
ENERGY STAR market penetration estimates, as follows:
8.1. Partner must submit the total number of ENERGY STAR certified Computers shipped in thecalendar year or an equivalent measurement as agreed to in advance by EPA and Partner.
Partner shall exclude shipments to organizations that rebrand and resell the shipments(unaffiliated private labelers).
8.2. Partner must provide unit shipment data segmented by meaningful product characteristics (e.g.,
type, capacity, presence of additional functions) as prescribed by EPA.
8.3. Partner must submit unit shipment data for each calendar year to EPA or an EPA-authorizedthird party, preferably in electronic format, no later than March 1 of the following year.
Submitted unit shipment data will be used by EPA only for program evaluation purposes and will beclosely controlled. If requested under the Freedom of Information Act (FOIA), EPA will argue that thedata is exempt. Any information used will be masked by EPA so as to protect the confidentiality of thePartner;

ENERGY STAR Program Requirements for Computers – Partner Commitments2

9. Report to EPA any attempts by recognized laboratories or Certification Bodies (CBs) to influence
testing or certification results or to engage in discriminatory practices.
10. Notify EPA of a change in the designated responsible party or contacts within 30 days using the My
ENERGY STAR Account tool (MESA) available at www.energystar.gov/mesa.

Training and Consumer Education
11. Partner shall agree to complete steps to educate users of their products about the benefits of power
management by including the following information with each Computer (i.e., in the user manual or on
a box insert):
11.1. Energy saving potential;
11.2. Financial saving potential;
11.3. Environmental benefits;
11.4. Information on ENERGY STAR and a link to www.energystar.gov; and11.5. ENERGY STAR logo (used in accordance with "The ENERGY STAR Identity Guidelines"
available at www.energystar.gov/logos).
12. In addition, a link should be made available to www.energystar.gov/powermanagement from
Computer product pages, product specifications, and related content pages.
13. At the manufacturer’s request, EPA will supply suggested facts and figures related to the above
criteria, template elements, or a complete template suitable for use in user guides or box inserts.

Performance for Special Distinction
In order to receive additional recognition and/or support from EPA for its efforts within the Partnership, the
ENERGY STAR Partner may consider the following voluntary measures, and should keep EPA informedon the progress of these efforts:
Provide quarterly, written updates to EPA as to the efforts undertaken by Partner to increaseavailability of ENERGY STAR certified products, and to promote awareness of ENERGY STAR and
its message.

Consider energy efficiency improvements in company facilities and pursue benchmarking buildings
through the ENERGY STAR Buildings program.



Purchase ENERGY STAR certified products. Revise the company purchasing or procurement
specifications to include ENERGY STAR. Provide procurement officials’ contact information to EPA
for periodic updates and coordination. Circulate general ENERGY STAR certified product information
to employees for use when purchasing products for their homes.



Feature the ENERGY STAR mark(s) on Partner website and other promotional materials. If
information concerning ENERGY STAR is provided on the Partner website as specified by the
ENERGY STAR Web Linking Policy (available in the Partner Resources section of the ENERGYSTAR website), EPA may provide links where appropriate to the Partner website.

Ensure the power management feature is enabled on all ENERGY STAR certified displays andcomputers in use in company facilities, particularly upon installation and after service is performed.

Provide general information about the ENERGY STAR program to employees whose jobs are
relevant to the development, marketing, sales, and service of current ENERGY STAR certified
products.

Provide a simple plan to EPA outlining specific measures Partner plans to undertake beyond theprogram requirements listed above. By doing so, EPA may be able to coordinate, and communicate

ENERGY STAR Program Requirements for Computers – Partner Commitments

3Partner’s activities, provide an EPA representative, or include news about the event in the ENERGYSTAR newsletter, on the ENERGY STAR website, etc. The plan may be as simple as providing a listof planned activities or milestones of which Partner would like EPA to be aware. For example,
activities may include: (1) increasing the availability of ENERGY STAR certified products by
converting the entire product line within two years to meet ENERGY STAR guidelines; (2)demonstrating the economic and environmental benefits of energy efficiency through special in-store
displays twice a year; (3) providing information to users (via the website and user’s manual) about
energy-saving features and operating characteristics of ENERGY STAR certified products; and (4)building awareness of the ENERGY STAR Partnership and brand identity by collaborating with EPA
on one print advertorial and one live press event.
Join EPA's SmartWay Transport Partnership to improve the environmental performance of thecompany's shipping operations. The SmartWay Transport Partnership works with freight carriers,
shippers, and other stakeholders in the goods movement industry to reduce fuel consumption,
greenhouse gases, and air pollution. For more information on SmartWay, visit
www.epa.gov/smartway.

Join EPA’s Green Power Partnership. EPA's Green Power Partnership encourages organizations to
buy green power as a way to reduce the environmental impacts associated with traditional fossil fuelbased electricity use. The partnership includes a diverse set of organizations including Fortune 500
companies, small and medium businesses, government institutions as well as a growing number ofcolleges and universities. For more information on Green Power, visit www.epa.gov/greenpower.

ENERGY STAR Program Requirements for Computers – Partner Commitments

4

ENERGY STAR® Program Requirements
Product Specification for Computers
Eligibility Criteria
Version 8.0
Rev. July-2022
Following is the Version 8.0 ENERGY STAR Product Specification for Computers. A product shall meetall of the identified criteria if it is to earn the ENERGY STAR.

1 DEFINITIONSA) Product Types:
1) Computer: A device which performs logical operations and processes data. For the purposes ofthis specification, computers include both stationary and portable units, including Desktop
Computers, Integrated Desktop Computers, Notebook Computers, Small-Scale Servers, Thin
Clients, and Workstations. Although computers are capable of using input devices and displays,
such devices are not required to be included with the computer upon shipment. Computers arecomposed of, at a minimum:a) A central processing unit (CPU) to perform operations. If no CPU is present, then the device
must function as a client gateway to a server which acts as a computational CPU;b) User input devices such as a keyboard, mouse, or touchpad; andc) An Integrated Display screen and/or the ability to support an external display screen to output
information.
2) Desktop Computer: A computer whose main unit is designed to be located in a permanent
location, often on a desk or on the floor. Desktop computers are not designed for portability andare designed for use with an external display, keyboard, and mouse. Desktop computers areintended for a broad range of home and office applications, including point of sale applications.
a) Integrated Desktop Computer: A Desktop Computer in which the computing hardware anddisplay are integrated into a single housing, and which is connected to ac mains power
through a single cable. Integrated Desktop Computers come in one of two possible forms: (1)a system where the display and computer are physically combined into a single unit; or (2) asystem packaged as a single system where the display is separate but is connected to themain chassis by a dc power cord and both the computer and display are powered from asingle power supply. As a subset of Desktop Computers, Integrated Desktop Computers are
typically designed to provide similar functionality as Desktop systems.
3) Notebook Computer: A computer designed specifically for portability and to be operated forextended periods of time both with and without a direct connection to an ac mains power source.
Notebook Computers include an Integrated Display, a non-detachable, mechanical keyboard(using physical, moveable keys), and pointing device.
a) Mobile Thin Client: A computer meeting the definition of a Thin Client, designed specificallyfor portability, and meeting the definition of a Notebook Computer. These products are
considered to be Notebook Computers for the purposes of this specification.
b) Two-In-One Notebook: A computer which resembles a traditional Notebook Computer with aclam shell form factor but has a detachable display which can act as an independent
Slate/Tablet when disconnected. The keyboard and display portions of the product must be
shipped as an integrated unit. Two-In-One Notebooks are considered Notebooks in theremainder of this specification and are therefore not referenced explicitly.
c) Mobile Workstation: A computer which meets the definition of Notebook Computer but also
meets all of the following criteria:

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(1) Has a mean time between failures (MTBF) of at least 13,000 hours (based on either
Telcordia SR-332, Issue X or field collected data);(2) Certification by 2 or more Independent Software Vendor (ISV) product certifications;these certifications can be in process, but partner shall ensure they are completed
within 3 months of certification;(3) Supports at least 32 gigabytes of system memory; and(4) Supports either:(a) At least one integrated or discrete GPU with frame buffer bandwidth of 96
gigabytes per second or greater; or(b) A total of 4 gigabytes or more of system memory with a bandwidth of 134
gigabytes per second or greater and an integrated GPU.
d) Multi-Screen Notebook: A computer which resembles a traditional Notebook Computer with aclam shell form factor but has a secondary display with touch and/or pen capability that canbe used as a touch screen keyboard in place of a traditional mechanical keyboard. These
products are considered to be Notebook Computers for purposes of this specification.
4) Slate/Tablet: A computing device designed for portability that meets all of the following criteria:a) Includes an integrated display with a diagonal size greater than 6.5 inches and less than 17.4
inches;b) Lacking an integrated, physical attached keyboard in its as-shipped configuration;c) Includes and primarily relies on touchscreen input; (with optional keyboard);d) Includes and primarily relies on a wireless network connection (e.g., Wi-Fi, 3G, etc.); ande) Includes and is primarily powered by an internal battery (with connection to the mains forbattery charging, not primary powering of the device).
5) Portable All-In-One Computer: A computing device designed for portability that meets all of thefollowing criteria:a) Includes an integrated display with a diagonal size greater than or equal to 17.4 inches;b) Lacking keyboard integrated into the physical housing of the product in its as-shipped
configuration;c) Includes and primarily relies on touchscreen input; (with optional keyboard);d) Includes wireless network connection (e.g. Wi-Fi, 3G, etc.); ande) Includes an internal battery6) E-Reader: A device designed for display and consumption of static images. The display ischaracterized by a low refresh rate and a display made of bistable materials where no energy isneeded to maintain a visible image, only to alter the image.
7) Small-scale Server: A computer that typically uses desktop components in a desktop form factor
but is designed primarily to be a storage host for other computers. Small-scale Servers aredesigned to perform functions such as providing network infrastructure services (e.g., archiving)and hosting data/media. These products are not designed to process information for othersystems or run web servers as a primary function. A Small-scale Server has the following
characteristics:a) Designed in a pedestal, tower, or other form factor similar to those of desktop computerssuch that all data processing, storage, and network interfacing is contained within one
box/product;b) Designed to operate 24 hours/day, 7 days/week, with minimal unscheduled downtime (on theorder of hours/year);

ENERGY STAR Program Requirements for Computers – Eligibility Criteria (Rev. July-2022)

Page 2 of 23c) Capable of operating in a simultaneous multi-user environment serving several users throughnetworked client units; andd) Designed for an industry accepted operating system for home or low-end server applications(e.g., Windows Home Server, Mac OS X Server, Linux, UNIX, Solaris).
8) Thin Client: An independently-powered computer that relies on a connection to remote computing
resources (e.g., computer server, remote workstation) to obtain primary functionality. Maincomputing functions (e.g., program execution, data storage, interaction with other Internet
resources) are provided by the remote computing resources. Thin Clients covered by thisspecification are (1) limited to devices with no rotational storage media integral to the computerand (2) designed for use in a permanent location (e.g. on a desk) and not for portability.
a) Integrated Thin Client: A Thin Client in which computing hardware and display areconnected to ac mains power through a single cable. Integrated Thin Client computerscome in one of two possible forms: (1) a system where the display and computer are
physically combined into a single unit; or (2) a system packaged as a single system
where the display is separate but is connected to the main chassis by a dc power cordand both the computer and display are powered from a single power supply. As a subsetof Thin Clients, Integrated Thin Clients are typically designed to provide similarfunctionality as Thin Client systems.
b) Ultra-thin Client: A computer with lesser local resources than a standard Thin Client that
sends raw mouse and keyboard input to a remote computing resource and receives backraw video from the remote computing resource. Ultra-thin clients cannot interface withmultiple devices simultaneously nor run windowed remote applications due to the lack ofa user-discernible client operating system on the device (i.e., beneath firmware, user
inaccessible).
9) Workstation: A high-performance, single-user computer typically used for graphics, CAD,
software development, financial and scientific applications among other compute intensive tasks.
Workstations covered by this specification (a) are marketed as a workstation; (b) do not support
altering frequency or voltage beyond the CPU and GPU manufacturers’ as shipped operating
specifications; and (c) has system hardware that supports error-correcting code (ECC) that
detects and corrects errors with dedicated circuitry on and across the CPU, interconnect, andsystem memory. In addition, a workstation meets two or more of the following criteria:a) Supports one or more discrete GPU or discrete compute acceleratorsb) Supports four or more slots of PCI-express, other than discrete GPU, connected to accessory
expansion slots or ports where each lane has a bandwidth of 8 gigabits per second (Gb/s) ormore.
c) Provide multi-processor support for two or more physically separate processor packages orsockets. (this requirement cannot be met with support for a single multi-core processor);
and/ord) Certification by 2 or more Independent Software Vendor (ISV) product certifications; thesecertifications can be in process, but partner shall ensure they are completed within 3 monthsof certification.
10) Rack-mounted Workstation: A workstation that is designed to be natively rack mounted as
described in IEC 60297-3-101:2004. The rack-mounted workstation may be accessed locally bydirect connection to the workstation and display or accessed remotely across a network by one ormore users.
B) Product Category: A second-order classification or sub-type within a product type that is based on
product features and installed components. Product categories are used in this specification todetermine certification and test requirements.

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C) Computer Components:
1) Graphics Processing Unit (GPU): An integrated circuit, separate from the CPU, designed toaccelerate the rendering of either 2D and/or 3D content to displays. A GPU may be mated with aCPU, on the system board of the computer or elsewhere to offload display capabilities from theCPU.
2) Discrete Graphics (dGfx): A graphics processor (GPU) which must contain a local memory
controller interface and local graphics-specific memory.
3) Integrated Graphics (iGfx): A graphics solution that does not contain Discrete Graphics.
4) Display: A commercially-available product with a display screen and associated electronics, often
encased in a single housing, that as its primary function displays visual information from (1) acomputer, workstation or server via one or more inputs (e.g., VGA, DVI, HDMI, DisplayPort, IEEE
1394, USB), (2) external storage (e.g., USB flash drive, memory card), or (3) a network
connection.
a) Enhanced-performance Integrated Display: An integrated Computer Display that has allof the following features and functionalities:(1) A contrast ratio of at least 60:1 at a horizontal viewing angle of at least 85°, with orwithout a screen cover glass;(2) A native resolution greater than or equal to 2.3 megapixels (MP); and(3) A color gamut of at least sRGB as defined by IEC 61966-2-1. Shifts in color space
are allowable as long as 99% or more of defined sRGB colors are supported.
5) External Power Supply (EPS): Also referred to as External Power Adapter. An external power
supply circuit that is used to convert household electric current into dc current or lower-voltage ac
current to operate a consumer product.
6) Internal Power Supply (IPS): A component internal to the computer casing and designed toconvert ac voltage from the mains to dc voltage(s) for the purpose of powering the computercomponents. For the purposes of this specification, an internal power supply shall be contained
within the computer casing but be separate from the main computer board. The power supply
shall connect to the mains through a single cable with no intermediate circuitry between the
power supply and the mains power. In addition, all power connections from the power supply tothe computer components, with the exception of a DC connection to a display in an Integrated
Desktop Computer, shall be internal to the computer casing (i.e., no external cables running fromthe power supply to the computer or individual components). Internal dc-to-dc converters used toconvert a single dc voltage from an external power supply into multiple voltages for use by thecomputer are not considered internal power supplies.
7) System Memory Bandwidth: The rate at which data can be read or stored into computer system’s
memory, expressed in gigabytes per second (GB/s).
D) Operational Modes:
1) Active State: The power state in which the computer is carrying out useful work in response to a)prior or concurrent user input or b) prior or concurrent instruction over the network. Active State
includes active processing, seeking data from storage, memory, or cache, including Idle State
time while awaiting further user input and before entering low power modes.
2) Idle State: The power state in which the operating system and other software have completed
loading, a user profile has been created, activity is limited to those basic applications that thesystem starts by default, and the computer is not in Sleep Mode. Idle State is composed of two
sub-states: Short Idle and Long Idle.

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a) Long Idle: The mode where the Computer has reached an Idle condition (i.e., 15 minutes
after OS boot or after completing an active workload or after resuming from Sleep Mode)and the main Computer Display has entered a low-power state where screen contents
cannot be observed (i.e., backlight has been turned off) but remains in the working mode
(ACPI G0/S0). If power management features are enabled as-shipped in the scenario
described in this definition, such features shall engage prior to evaluation of Long Idle
(e.g., display is in a low power state, HDD may have spun-down), but the Computer isprevented from entering Sleep Mode. PLONG_IDLE represents the average power measured
when in the Long Idle Mode.
b) Short Idle: The mode where the Computer has reached an Idle condition (i.e., 5 minutes
after OS boot or after completing an active workload or after resuming from Sleep Mode),the screen is on, and Long Idle power management features have not engaged (e.g.
HDD is spinning and the Computer is prevented from entering sleep mode). PSHORT_IDLE
represents the average power measured when in the Short Idle Mode.
3) Off Mode: The lowest power mode which cannot be switched off (influenced) by the user and thatmay persist for an indefinite time when the appliance is connected to the main electricity supply
and used in accordance with the manufacturer’s instructions. For systems where ACPI standards
are applicable, Off Mode correlates to ACPI System Level S5 state.
4) Sleep Mode: A low power mode that the computer enters automatically after a period of inactivity
or by manual selection. A computer with Sleep capability can quickly “wake” in response to
network connections or user interface devices from initiation of wake event to a readable display.
For systems where ACPI standards are applicable, Sleep Mode most commonly correlates to
ACPI System Level S3 (suspend to RAM) state. PSLEEP represents the average power measured
when in the Sleep Mode.
5) Alternative Low Power Mode (ALPM): A low power mode that the computer enters automaticallyafter a period of inactivity or by manual selection that is defined by the display turning off and thecomputer entering a state of reduced functionality. A computer with Alternative Low Power Mode
must maintain immediate responsiveness to network connections or user interface devices. PALPM
represents the average power measured when in the Alternative Low Power Mode.
E) Networking and Additional Capabilities:
1) Additional Internal Storage: Any and all internal hard disk drives (HDD) or solid-state drives (SSD)
installed beyond the primary storage device where the operating system is installed in the
products as shipped state. This definition does not include external drives.
2) Energy Efficient Ethernet (EEE): A technology which enables reduced power consumption of
Ethernet interfaces during times of low data throughput. Specified by IEEE 802.3az.
3) Full Network Connectivity: The ability of the computer to maintain network presence while in
Sleep Mode or an Alternative Low Power Mode (ALPM) with power demand of less than or equal
to 10 watts and intelligently wake when further processing is required (including occasional
processing required to maintain network presence). Presence of the computer, its network
services and applications, is maintained even though the computer is in an ALPM. From thevantage point of the network, a computer with full network connectivity that is in ALPM isfunctionally equivalent to an idle computer with respect to common applications and usage
models. Full network connectivity in ALPM is not limited to a specific set of protocols but cancover applications installed after initial installation. Also referred to as “network proxy”
functionality and as described in the Ecma-393 standard.
a) Network Proxy - Base Capability: To maintain addresses and presence on the network while
in Sleep Mode or ALPM, the system handles IPv4 ARP and IPv6 NS/ND.
b) Network Proxy - Full Capability: While in Sleep Mode or ALPM, the system supports BaseCapability, Remote Wake, and Service Discovery/Name Services.
c) Network Proxy - Remote Wake: While in Sleep Mode or ALPM, the system is capable ofremotely waking upon request from outside the local network. Includes Base Capability.

ENERGY STAR Program Requirements for Computers – Eligibility Criteria (Rev. July-2022)

Page 5 of 23d) Network Proxy - Service Discovery/Name Services: While in Sleep Mode or ALPM, thesystem allows for advertising host services and network name. Includes Base Capability.
4) Constant Network Connectivity: A capability that allows the wake of system operating system orsoftware to facilitate communication and downloads from the network (e.g. instant messaging,email, management and maintenance tasks, etc.)
5) Network Interface: The components (hardware and software) whose primary function is to makethe computer capable of communicating over one or more network technologies. Examples of
Network Interfaces are IEEE 802.3 (Ethernet) and IEEE 802.11 (Wi-Fi).
6) Wake Event: A user, scheduled, or external event or stimulus that causes the computer totransition from Sleep Mode or Off Mode to an active state of operation. Examples of wake events
include, but are not limited to: movement of the mouse, keyboard activity, controller input, realtime clock event, or a button press on the chassis, and in the case of external events, stimulus
conveyed via a remote control, network, modem, etc.
7) Wake On LAN (WOL): Functionality which allows a computer to transition from Sleep Mode or Off
Mode to an Active State of operation when directed by a network Wake Event via Ethernet.
8) Switchable Graphics: Functionality that allows Discrete Graphics to be disabled when not
required in favor of Integrated Graphics.
Note: This functionality allows lower power and lower capability integrated GPUs to render the
display while on battery or when the output graphics are not overly complex while then allowing
the more power consumptive but more capable discrete GPU to provide rendering capability
when required.
F) Marketing and Shipment Channels:
1) Enterprise Channels: Sales channels typically used by large and medium-sized business,government, educational, or other organizations to purchase computers for use in managed
client/server environments.
2) Model Name: A marketing name that includes reference to the computer model number, productdescription, or other branding references.
3) Model Number: A unique marketing name or identification reference that applies to a specifichardware and software configuration (e.g., operating system, processor type, memory, GPU), andis either pre-defined or selected by a customer.
G) Product Family: A high-level description referring to a group of computers sharing one
chassis/motherboard combination that often contains hundreds of possible hardware and software
configurations. Product models within a family differ from each other according to one or morecharacteristics or features that either (1) have no impact on product performance with regard to
ENERGY STAR certification criteria, or (2) are specified herein as acceptable variations within a
product family. For Computers, acceptable variations within a product family include:
1) Color;
2) Housing; and3) Electronic components other than the chassis/motherboard, such as the processor,
memory, GPU, etc.

2 SCOPE
2.1
2.1.1

Included Products
Products that meet the definition of a Computer and one of the following Product Type definitions,as specified herein, are eligible for ENERGY STAR certification, with the exception of products
listed in Section 2.2:

ENERGY STAR Program Requirements for Computers – Eligibility Criteria (Rev. July-2022)

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i.

Desktop Computers and Integrated Desktop Computers;ii.

Notebook Computers;iii. Slates/Tablets;
iv. Portable All-In-One Computers;v.

Workstations; andvi. Thin Clients.

2.2

Excluded Products

2.2.1

Products that are covered under other ENERGY STAR product specifications are not eligible forcertification under this specification. The list of specifications currently in effect can be found atwww.energystar.gov/products.

2.2.2

The following products are not eligible for certification under this specification:i.

Docking Stations;ii.

Game Consoles;iii. E-Readers;iv. Handheld gaming devices, typically battery powered and intended for use with an integral
display as the primary display;v.

Mobile Thin Clients not meeting the definition of Notebook Computer;vi. Personal Digital Assistant devices (PDAs);vii. Point of Sale (POS) products that do not use internal components common to Notebook,
Desktop, or Integrated Desktop Computers, including a processor, motherboard, andmemory;viii. Slate/Tablet based POS products;
ix. Handheld Computers and Slates/Tablets which contain cellular voice capability;x.

Ultra-thin Clients; andxi. Small-scale Servers.

3 CERTIFICATION CRITERIA
3.1

Significant Digits and Rounding

3.1.1

All calculations shall be carried out with directly measured (unrounded) values.

3.1.2

Unless otherwise specified in this specification, compliance with specification limits shall be
evaluated using directly measured or calculated values without any benefit from rounding.

3.1.3

Directly measured or calculated values that are submitted for reporting on the ENERGY STAR
website shall be rounded to the nearest significant digit as expressed in the corresponding
specification limit.

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3.2

General Requirements

3.2.1

Power supply test data and test reports from testing entities recognized by EPA to perform power
supply testing shall be accepted for the purpose of certifying the ENERGY STAR product.

3.2.2

Internal Power Supply (IPS) Requirements: IPSs used in Computers eligible under thisspecification must meet the following requirements when tested using the Generalized InternalPower Supply Efficiency Test Protocol, Rev. 6.6 (available athttps://www.plugloadsolutions.com/docs/collatrl/print/Generalized_Internal_Power_Supply_Efficie
ncy_Test_Protocol_R6.7.1.pdf ).
i.

IPS with maximum rated output power less than 75 watts shall meet minimum efficiency
requirements as specified in Table 1.

ii.

IPS with maximum rated output power greater than or equal to 75 watts shall meet bothminimum efficiency requirements and minimum power factor requirements, as specified inTable 1 and Table 2 as applicable.

Table 1: Requirements for Internal Power Supplies with Rated Output of 500 Watts and Below
Loading Condition(Percentage of Nameplate
Output Current)
10%
20%
50%
100%

Minimum
Efficiency

Minimum
Power Factor

0.80
0.82
0.85
0.82

0.90
-

Table 2: Requirements for Internal Power Supplies with Rated Output Above 500 Watts
Loading Condition(Percentage of Nameplate
Output Current)
10%
20%
50%
100%
3.2.3

Minimum
Efficiency

Minimum
Power Factor

0.80
0.87

-

0.90
0.87

0.90
-

External Power Supply (EPS) Requirements: Single- and Multiple-voltage EPSs shall meet theLevel VI or higher performance requirements under the International Efficiency Marking Protocol
when tested according to the Uniform Test Method for Measuring the Energy Consumption ofExternal Power Supplies, Appendix Z to 10 CFR Part 430.
i.

Single-voltage EPSs shall include the Level VI or higher marking.

ii.

Adaptive EPSs meeting Level VI or higher shall include the Level VI or higher marking.

iii. Additional information on the Marking Protocol is available
at http://www.regulations.gov/#!documentDetail;D=EERE-2008-BT-STD-0005-0218
3.2.4

Energy Efficient Ethernet (EEE) Requirements: All products which contain one or more Ethernet
ports with a bandwidth of 1Gb/s or higher shall have EEE supported in each of these ports in theiras-shipped configuration.

ENERGY STAR Program Requirements for Computers – Eligibility Criteria (Rev. July-2022)

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3.3
3.3.1

Power Management Requirements
Products shall include power management features in their “as-shipped” condition as specified inTable 3, subject to the following conditions:i.

For Thin Clients, the Wake-on-LAN (WOL) requirement shall apply for products designed toreceive software updates from a centrally managed network while in Sleep Mode or in Off
Mode. Thin Clients whose standard software upgrade framework does not require off-hours
scheduling are exempt from the WOL requirement.

ii.

For Notebooks, WOL may be automatically disabled when the product is disconnected fromac mains power.

iii. For all products with WOL, directed packet filters shall be enabled and set to an industry
standard default configuration.
iv. Products that do not support Sleep Mode by default are only subject to the Display Sleep
Mode requirement.

ENERGY STAR Program Requirements for Computers – Eligibility Criteria (Rev. July-2022)

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Thin Clients

Workstations

Wake
Management

Slates/Tablets

Wake onLAN(WOL)

Notebooks

Display
Sleep
Mode

Portable All-In-Ones

SystemSleepi/Alternative
Low
Power
Mode

Integrated Desktops

Mode or
Mode
Transition

Desktops

Table 3: Power Management Requirements

Yes

Yes

Yes

Yes

N/A

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

N/A

Yes

Yes

Yes

Yes

Yes

Yes

N/A

Yes

Yes

Requirement(1) Sleep/Alternative Low Power
Mode shall be set to activate after nomore than 30 minutes of user
inactivity.
(2) The speed of any active 1 Gb/s or
faster Ethernet network links shall be
reduced when transitioning to Sleep
Mode or Off Mode.
Or the links shall enter Energy
Efficient Ethernet state whentransitioning to Alternative Low PowerMode(1) Display Sleep Mode shall be set toactivate after no more than 15
minutes of user inactivity.
(1) Computers with Ethernet
capability shall provide users with an
option to enable and disable WOL for
Sleep Mode.
(2) Computers with Ethernet
capability that are shipped throughenterprise channels shall either:(a) be shipped with WOL enabled
by default for Sleep Mode, when thecomputer is operating on ac mains
power; or(b) provide users with the ability toenable WOL that is accessible fromboth the client operating systemuser interface and over the
networkii.
(1) Computers with Ethernet
capability that are shipped throughenterprise channels shall:(a) be capable of both remote (via
network) and scheduled (via realtime clock) wake events from Sleep
Mode, and(b) provide clients with the ability tocentrally manage (via vendor tools)
any wake management settings thatare configured through hardware
settings if the manufacturer has
control over such features.

ENERGY STAR Program Requirements for Computers – Eligibility Criteria (Rev. July-2022)

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3.4
3.4.1

User Information Requirements
Products shall be shipped with informational materials to notify customers of the following:i.

A description of power management settings that have been enabled by default,ii.

A description of the timing settings for various power management features, andiii. Instructions for properly waking the product from Sleep Mode.
3.4.2

Products shall be shipped with one or more of the following:i.

A list of default power management settings.

ii.

A note stating that default power management settings have been selected for compliancewith ENERGY STAR (within 15 min of user inactivity for the display, within 30 min for thecomputer, if applicable per Table 3), and are recommended by the ENERGY STAR programfor optimal energy savings.

iii. Information about ENERGY STAR and the benefits of power management, to be located ator near the beginning of the hard copy or electronic user manual, or in a package or box
insert.
3.4.3

3.5

Provisions 3.4.1 and 3.4.2 may be met through use of either electronic or printed productdocumentation, provided it adheres to all of the following:i.

Documentation is shipped with the product (e.g., in a printed manual or insert, on included
optical media, in a file installed with the software load shipped to the customer) or available
electronically on the manufacturer’s website. In the latter case, instructions for accessing theinformation on the website shall be provided in the product package or on the Desktop or
home screen; andii.

Documentation is included either (a) only with ENERGY STAR certified Computers; or (b) as
part of the standard documentation if and only if accompanied by EPA-approved customer
guidance on how to identify if their computer configuration is ENERGY STAR certified.

Requirements for Desktop, Integrated Desktop, and Notebook Computers

3.5.1

Resume Time Requirement: Notebook computers are required to wake from sleep or analternative low power mode with a latency of less than or equal to 5 seconds from initiation of
wake event to system becoming fully usable including rendering of display. Desktop andIntegrated Desktop Computers shall meet this same requirement, but with a latency of less thanor equal to 10 seconds. Manufacturers shall self-declare that the product can meet thisrequirementiii.

3.5.2

Calculated Typical Energy Consumption (ETEC) for Desktop, Integrated Desktop, and Notebook
Computers per Equation 1 shall be less than or equal to the maximum TEC requirement(ETEC_MAX) per Equation 2, subject to the following requirements:i.

The Additional Internal Storage adder allowance (TECSTORAGE) shall be applied if there are
more than one internal storage devices present in the product, in which case it shall only beapplied once.

i Where Sleep Mode is supported by the UUT by default and Sleep Mode power is used as part of the

TEC equation for qualification.
ii Option (b) is not permitted for systems that use WOL in order to meet the definition of Full Network
Connectivity to claim the Full Capability mode weighting.
iii For purposes of ENERGY STAR third-party certification, these requirements shall not be reviewed
when products are initially certified nor during subsequent verification testing. Rather, EPA reserves theright to request supporting documentation at any time. Resume time requirements do not apply toworkstations or thin clients.
ENERGY STAR Program Requirements for Computers – Eligibility Criteria (Rev. July-2022)

Page 11 of 23

ii.

The Integrated Display adder allowance (TECINT_DISPLAY) applies only for Integrated Desktops
and Notebooks and may be applied for each display. For Enhanced-performance Integrated
Displays, the adder is calculated as presented in Table 11 and Equation 3.

iii. For a product to certify for the Full Network Connectivity mode weighting or incentive, one of
the following sets of criteria shall be satisfied:•

Option 1:•-

Products shall meet ECMA 393.

-

Notebook Computer products shall have the applied level of functionality in Table 5
enabled and configured by default upon shipment.

-

Desktop and Integrated Desktop products shall apply the appropriate
ALLOWANCEPROXY incentive addressed in Equation 2 below, but only if the productmeets ECMA 393 full capablity.

Option 2:-

Products shall be capable of Sleep Mode or an Alternative Low Power Mode which
maintains constant network connectivity with energy consumption less than orequal to 2.5 watts for Notebook or Integrated Desktop Computers in order to qualify
for the Full Capability mode weighting and applicable incentives in Table 7
respectively. The same requirement applies for Desktop Computers, but with anenergy consumption less than or equal to 3.0 watts.

Note: If a Notebook Computer product does not comply with Option 1 or 2 above, the productshall be tested and reported with Conventional mode weightings shown in Table 5. Full
Network Connectivity is a manufacturer-reported parameter. On Mac computers, “Wake for
network access” enabled within the Energy Saver/Power Adapter Preferences signifies BaseCapability or better. On Windows computers, “ARP Offload” or “NS Offload” or similar enabledwithin the Advanced Properties of the Network Interface Card (accessed through the Device
Manager) signifies Base Capability or better. For systems with a dual Network Interface Card
(NIC) configuration, only one NIC configuration needs to comply. The manufacturer can
provide further guidance on how to confirm Proxy Support.
iv. For Notebooks, Desktops, and Integrated Desktops that use an Alternative Low Power Modein place of System Sleep Mode and Long Idle Mode, power in Alternative Low Power Mode
(PALPM) may be used in place of both the power in Sleep (PSLEEP) and the power in Long Idle
(PLONG_IDLE) in Equation 1 if the Alternative Low Power Mode measured power is less than orequal to 10 watts. In such instances, (𝑃𝑆𝐿𝐸𝐸𝑃 × 𝑇𝑆𝐿𝐸𝐸𝑃 ) and (𝑃𝐿𝑂𝑁𝐺_𝐼𝐷𝐿𝐸 × 𝑇𝐿𝑂𝑁𝐺_𝐼𝐷𝐿𝐸 )are replaced by (𝑃𝐴𝐿𝑃𝑀 × 𝑇𝑆𝐿𝐸𝐸𝑃 ) and (𝑃𝐴𝐿𝑃𝑀 × 𝑇𝐿𝑂𝑁𝐺_𝐼𝐷𝐿𝐸 ); Equation 1 remains
otherwise unchanged.
v.

Notebooks, Desktops, and Integrated Desktops with switchable graphics may not apply the
Discrete Graphics allowance, TECGRAPHICS, from Table 11 in Equation 2. However, for
Desktop and Integrated Desktop systems that provide automated Switchable Graphics
enabledby default, an allowance equal to 14.4 watts (Desktop or Integrated Desktop) may be
applied. This capability is manufacturer-declared.
Equation 1: TEC Calculation (ETEC) for Desktop, Integrated Desktop,
and Notebook Computers

𝐸𝑇𝐸𝐶 =

8760
× (𝑃𝑂𝐹𝐹 × 𝑇𝑂𝐹𝐹 + 𝑃𝑆𝐿𝐸𝐸𝑃 × 𝑇𝑆𝐿𝐸𝐸𝑃 + 𝑃𝐿𝑂𝑁𝐺_𝐼𝐷𝐿𝐸 × 𝑇𝐿𝑂𝑁𝐺_𝐼𝐷𝐿𝐸
1000+ 𝑃𝑆𝐻𝑂𝑅𝑇_𝐼𝐷𝐿𝐸 × 𝑇𝑆𝐻𝑂𝑅𝑇_𝐼𝐷𝐿𝐸 )Where:▪
POFF = Measured power consumption in Off Mode (W);

ENERGY STAR Program Requirements for Computers – Eligibility Criteria (Rev. July-2022)

Page 12 of 23

▪
▪
▪
▪

PSLEEP = Measured power consumption in Sleep Mode (W);
PLONG_IDLE = Measured power consumption in Long Idle Mode(W);
PSHORT_IDLE = Measured power consumption in Short Idle Mode
(W); and
TOFF, TSLEEP, TLONG_IDLE, and TSHORT_IDLE are mode weightings as
specified in Table 4 (for Desktops, Integrated Desktops) or
Table 5 (for Notebooks).

Table 4: Mode Weightings for Desktops and Integrated Desktop Computers
Mode
Weighting

Conventional

TOFF
TSLEEP

15%45%

TLONG_IDLETSHORT_IDLE

10%
30%

Table 5: Mode Weightings for Notebook Computers
Full Network Connectivity
Mode
Weighting

Conventional

Base
Capability

Remote Wake

TOFF
TSLEEP

25%
35%

25%
39%

25%
41%

Service
Discovery /Name Services
25%
43%

TLONG_IDLETSHORT_IDLE

10%
30%

8%
28%

7%
27%

6%
26%

Full
Capability
25%
45%
5%
25%

Equation 2: ETEC_MAX Calculation for Desktop, Integrated Desktop, and Notebook Computers

ETEC_MAX = (1+ALLOWANCEPSU +ALLOWANCEPROXY ) × (TECBASE + TECMEMORY + TECGRAPHICS +TECSTORAGE + TECINT_DISPLAY + TECSWITCHABLE + TECMOBILEWORKSTATION + TEC>1G to < 10GLAN + TEC10GLAN)
Where:▪
ALLOWANCEPSU is an allowance provided to power supplies thatmeet the optional more stringent efficiency levels specified inTable 6; power supplies that do not meet the requirements
receive an allowance of 0;▪
ALLOWANCEPROXY is an allowance provided only to desktops
and integrated desktops which implement a full capability - full
network proxy solution. Products meeting Option 1 in Section
3.5.2 above may claim an allowance of 0.12, while products
meeting Option 2 can apply the applicable adder in Table 7
below. This allowance can only be applied once per product.
▪
TECBASE is the Base allowance specified in Table 8, Table 9, orTable 10; and,▪
TECGRAPHICS is the discrete graphics allowance as specified inTable 11, with the exception of systems with integrated graphics,
which do not receive an allowance, or Desktops and Integrated
Desktops with switchable graphics enabled by default, which
receive an allowance through TECSWITCHABLE; andENERGY STAR Program Requirements for Computers – Eligibility Criteria (Rev. July-2022)

Page 13 of 23

▪

TECMEMORY , TECSTORAGE, TECINT_DISPLAY, TECSWITCHABLE,TECMOBILEWORKSTATION, TEC>1G to < 10GLAN and TEC10GLAN are
adder allowances as specified in Table 11.

Table 6: Internal Power Supply Efficiency Allowance
Power
SupplyType

Minimum Efficiency at Specified
Proportion of Rated Output
Current

ComputerType
Desktop

IPS

Integrated
Desktop

10%

20%

50%

100%

0.86
0.90
0.86
0.90

0.90
0.92
0.90
0.92

0.92
0.94
0.92
0.94

0.89
0.90
0.89
0.90

AllowancePSU
0.015
0.03
0.015
0.04

Table 7: Alternative Low Power Mode or Sleep Modeiv – Full Network Proxy Allowance
ComputerType

Maximum Measured Power
Limit of ALPM or Sleep (Watts)

AllowancePROXY

2.5
3.0
2.0
2.5

0.12
0.06
0.06
0.03

Desktop
Integrated
Desktop

Table 8: Base TEC (TECBASE) Allowances for Desktops

Category
Name
I1
I2

Graphics
Capabilityv
Integrated or
Switchable
Graphics

D1

Desktop
Performance
Base
Score, Pvi
AllowanceP≤8
26.0

Discrete
Graphics

D2

P>8

46.0

P≤8

35.0

P>8

45.0

Table 9: Base TEC (TECBASE) Allowances for Integrated Desktops
Category
Name

Integrated Desktop

1

Performance
Score, Pivo
P≤8

Base
Allowance
9.0

2

P>8

27.0

iv Table 7 only applies to products with an ALPM or Sleep Mode that maintains constant network connectivity.
v
vi

Discrete Graphics capability is categorized based on frame buffer bandwidth, as shown in Table 11.
P = [# of CPU cores] × [CPU clock speed (GHz)] , where # of cores represents the number of physical CPU
cores and CPU clock speed represents the Max TDP core frequency, not the turbo boost frequency.

ENERGY STAR Program Requirements for Computers – Eligibility Criteria (Rev. July-2022)

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Table 10: Base TEC (TECBASE) Allowances for Notebooks
Category
Name

Notebook

01

Performance
Score, Piv
P≤2
2<P<8

Base
Allowance
6.5
8.0

2

P≥8

14.0

Table 11: Functional Adder Allowances for Desktop, Integrated Desktop, Thin Client, andNotebook Computers

Function

Desktop

1.7 + (0.24 × GB)

2.4 + (0.294 × GB)

viii ,ix

50.4 ×tanh(0.0038 × FB_BW – 0.137) + 23

29.3 ×tanh(0.0038 × FB_BW –0.137) + 13.4

14.4

N/A

3.5” HDD

16.5

N/A

2.5” HDD
Hybrid HDD/SSD
SSD (including
M.2 port solutions)

2.1
0.8

TECGRAPHICS (kWh)TECSWITCHABLE (kWh)x

(kWh)

xi

TECINT_DISPLAY(kWh)

Notebook

vii

TECMEMORY (kWh)TECSTORAGE

Integrated Desktop

0.4

A < 190[(3.43 × r) + (0.148 × A) +1.30] × (1 + EP)

190 ≤ A < 210[(3.43× r) + (0.018 × A) + 26.1]
× (1 + EP)

N/A

xii

210 ≤ A < 315[(3.43 × r) + (0.078 × A) +13.2] × (1 + EP)

A ≥ 315[(3.43 × r) + (0.156 × A) - 11.3]
× (1 + EP)
xiii

2.6

8.76 ×0.30 × (1+EP) × (0.43×r +0.0263×A)

N/A

4.0

TEC>1G to <10GLAN (kWh)xiv

4.0

N/A

TEC10GLAN (kWh)xv

18.0

N/A

TECMOBILEWORKSTATION (kWh)vii TECMEMORY Adder: GB applies per GB installed in the system.
viii TECGRAPHICS Adder: Applies to only the first dGfx installed in the system, but not Switchable Graphics.
ix FB_BW: Is the display frame buffer bandwidth in gigabytes per second (GB/s). This is a manufacturer declaredparameter and should be calculated as follows: (Data Rate [Mhz] × Frame Buffer Data Width [bits]) / ( 8 × 1000 )x TECSWITCHABLE Incentive: Applies to automated switching that is enabled by default in Desktops and Integrated
Desktops.
xi TECSTORAGE Adder: Applies once if system has an Additional Internal Storage device.
xii TECINT_DISPLAY Adder: EP is the Enhanced Performance Display allowance calculated per Equation 3;
r is the Screen resolution in megapixels; and A is viewable screen area in square inches. This adder may be
applied for each display if there are multiple displays in the system which are enabled as-shipped and in testing.
xiii TECMOBILEWORKSTATION Adder: Applies once if the system meets the full Mobile Workstation definition in Section 1.
xiv TEC>1G to <10GLAN Adder: Applies once if system contains an Ethernet port with rated throughput greater than 1Gb/s
but less than 10 Gb/s.
xv TEC10GLAN Adder: Applies once if the system contains a 10 Gb/s Ethernet port.
ENERGY STAR Program Requirements for Computers – Eligibility Criteria (Rev. July-2022)

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Equation 3: Calculation of Allowance for Enhanced-performance Integrated Displays0,
𝑁𝑜 𝐸𝑛ℎ𝑎𝑛𝑐𝑒𝑑 𝑃𝑒𝑟𝑓𝑜𝑟𝑚𝑎𝑛𝑐𝑒 𝐷𝑖𝑠𝑝𝑙𝑎𝑦
𝐸𝑃 = { 0.3, 𝐸𝑛ℎ𝑎𝑛𝑐𝑒𝑑 𝑃𝑒𝑟𝑓𝑜𝑟𝑚𝑎𝑛𝑐𝑒 𝐷𝑖𝑠𝑝𝑙𝑎𝑦, 𝑑 < 27
0.75, 𝐸𝑛ℎ𝑎𝑛𝑐𝑒𝑑 𝑃𝑒𝑟𝑓𝑜𝑟𝑚𝑎𝑛𝑐𝑒 𝐷𝑖𝑠𝑝𝑙𝑎𝑦, 𝑑 ≥ 27
Where:

▪

3.6
3.6.1

3.7
3.7.1

d is the diagonal of the screen, in inches

Requirements for Slates/Tablets and Portable All-In-One Computers
Slates/Tablets and Portable All-In-One Computers shall follow all of the requirements for
Notebook Computers in Section 3.5 above, including calculations of the following:i.

Calculated Typical Energy Consumption (ETEC), using Equation 1 with the Notebook
Computer Mode Weightings from Table 5.

ii.

Calculated Maximum Allowed Typical Energy Consumption (ETEC_MAX), using Equation 2 withthe appropriate base Notebook Computer allowance from Table 10, and applicable Notebook
Computer functional adder allowances from Table 11.

Requirements for Workstations
Weighted power consumption (PTEC) as calculated per Equation 4 shall be less than or equal tothe maximum weighted power consumption requirement (PTEC_MAX) as calculated per Equation 5.
Equation 4: PTEC Calculation for Workstations

PTEC = POFF×TOFF + PSLEEP×TSLEEP + PLONG_IDLE×TLONG_IDLE+ PSHORT_IDLE×TSHORT_IDLE
Where:▪
POFF = Measured power consumption in Off Mode (W);▪
PSLEEP = Measured power consumption in Sleep Mode (W);▪
PLONG_IDLE = Measured power consumption in Long Idle Mode(W);▪
PSHORT_IDLE = Measured power consumption in Short Idle Mode
(W); and▪
TOFF, TSLEEP, TLONG_IDLE, and TSHORT_IDLE are mode weightings as
specified in Table 12.

Table 12: Mode Weightings for Workstations
TOFF

TSLEEP

TLONG_IDLETSHORT_IDLE

10%

35%

20%

35%

Equation 5: PTEC_MAX Calculation for Workstations

PTEC_MAX = 0.28×(PMAX + NHDD×5)
Where:▪
PMAX = Measured maximum power consumption (W)▪
NHDD = Number of installed hard disk drives (HDD) or solid-statedrives (SSD)

ENERGY STAR Program Requirements for Computers – Eligibility Criteria (Rev. July-2022)

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3.7.2

3.7.3

3.8
3.8.1

Active State Benchmark: To be ENERGY STAR certified, a Workstation must be submitted for
certification with the following information disclosed in full:i.

LINPAC benchmark test results, compiler optimizations, and total energy consumed over theduration of the test; andii.

SPECviewperf benchmark test results, configuration options, total duration of the test, andtotal energy consumed over the duration of the test.

Desktop Workstations: Products marketed as workstations may be ENERGY STAR certified
under the Desktop requirements in Section 3.5 instead of the Workstation requirements in
Section 3.7, at the Partner’s option. EPA will identify Workstations certified as Desktops as“Desktops” in all ENERGY STAR marketing materials, on certified product lists, etc.

Requirements for Thin Clients
Calculated Typical Energy Consumption (ETEC) per Equation 1 shall be less than or equal to theMaximum TEC Requirement (ETEC_MAX), as calculated per Equation 6, subject to the following
requirements.
i.

Allowances can only be applied if the corresponding adders are enabled by default.

ii.

Thin Clients shall utilize the mode weightings in Table 13 when calculating ETEC.

iii. For Thin Clients that lack a discrete System Sleep Mode, Long Idle State power (PLONG_IDLE)
may be used in place of Sleep Mode Power (PSLEEP) in Equation 1 so long as the systemmeets the Thin Client TEC allowance. In such instances, (𝑃𝑆𝐿𝐸𝐸𝑃 × 𝑇𝑆𝐿𝐸𝐸𝑃 ), is replaced by(𝑃𝐿𝑂𝑁𝐺_𝐼𝐷𝐿𝐸 × 𝑇𝑆𝐿𝐸𝐸𝑃 ); Equation 1 remains otherwise unchanged.
Table 13: Mode Weightings for Thin ClientsTOFF

TSLEEP

TLONG_IDLETSHORT_IDLE

45%

5%

15%

35%

Equation 6: Calculation of ETEC_MAX for Thin Clients

ETEC_MAX = TECBASE + TECGRAPHICS + TECWOL + TECINT_DISPLAY
Where:▪
▪
▪
▪
▪
▪

TECBASE is the Base Allowance specified in Table
Table 14;TECGRAPHICS is the Discrete Graphics allowance specified inTable 14 if applicable;
TECWOL is the Wake-on-LAN allowance specified in Table
Table 14 if applicable;
TECINT_DISPLAY is the Integrated Display allowance for Integrated
Desktops specified in Table 11 if applicable; andTable 14: Adder Allowances for Thin Clients
Adder
TECBASETECGRAPHICSTECWOL

Allowance
(kWh)
31
36
2

ENERGY STAR Program Requirements for Computers – Eligibility Criteria (Rev. July-2022)

Page 17 of 23

Note: Products intended for sale in the US market are subject to minimum toxicity and recyclability
requirements. Please see ENERGY STAR® Program Requirements for Computers: Partner Commitments
for details.

4 TESTING
4.1
4.1.1

Test Methods
When testing Computer products, the test methods identified in Table 15 shall be used todetermine ENERGY STAR certification.
Table 15: Test Methods for ENERGY STAR Certification

4.2
4.2.1

Product Type orComponent

Test Method

All

ENERGY STAR Draft Test Method for Computers, Rev. July 2022

Number of Units Required for Testing
Representative Models shall be selected for testing per the following requirements:i.

For certification of an individual product configuration, the unique configuration that is
intended to be marketed and labeled as ENERGY STAR is considered the Representative
Model.

ii.

For certification of a Product Family of all product types, with the exception of Workstations,product configurations that represent the worst-case power consumption for each productcategory within the family are considered Representative Models. When submitting Product
Families, manufacturers continue to be held accountable for any efficiency claims madeabout their products, including those not tested or for which data were not reported. This
includes ensuring that all models shipped as ENERGY STAR certified within the productfamily maintain the same power management settings when testing the Representative
Model(s).

iii. For systems that meet the definition for multiple categories (as defined in Section 1.B)
depending on the specific configuration, manufacturers will have to submit the highest power
configuration for each category under which they would like the system to be ENERGY STAR
certified. For example, a system that could be configured as either a Category I1 or D1
Desktop, as defined in Table 8 would require submittal of the highest power configuration forboth categories in order to be ENERGY STAR certified. If a product could be configured tomeet all categories, it would then have to submit data for the highest power configuration in
all categories.
iv. For certification of a Product Family of Workstations under the Workstation or Desktop
product type, the product configuration that represents the worst-case power consumption
with a single GPU within the family is considered the Representative Model.
Note: Workstations that meet ENERGY STAR requirements with a single graphics device
may also have a configuration with more than one graphics device be ENERGY STAR
certified, provided the additional hardware configuration is identical with the exception of theadditional graphics device(s). The use of multiple graphics includes, but is not limited to,
driving multiple displays and ganging for high performance, multi-GPU configurations (e.g.
ATI Crossfire, NVIDIA SLI). In such cases, and until such time as SPECviewperf® supports
multiple graphics threads, manufacturers may submit the test data for the workstation withthe single graphics device for both configurations without retesting the system.
4.2.2

A single unit of each Representative Model shall be selected for testing.

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4.2.3All units/configurations for which a Partner is seeking ENERGY STAR certification, must meet the
ENERGY STAR requirements. However, if a Partner wishes to certify configurations of a model
for which non-ENERGY STAR certified alternative configurations exist, the Partner must assign
the certified configurations an identifier in the model name/number that is unique to ENERGYSTAR certified configurations. This identifier must be used consistently in association with thecertified configurations in marketing/sales materials and on the ENERGY STAR list of certified
products (e.g. model A1234 for baseline configurations and A1234-ES for ENERGY STAR
certified configurations).
Note: There may be cases—as described in the paragraph above—where not allunits/configurations will meet ENERGY STAR requirements. If so, the worst-case configuration
for test will be the worst-case certified configuration, and not one of the presumably even higherenergy consuming non-certified configurations.

4.3
4.3.1

4.4
4.4.1

International Market Certification
Products shall be tested for certification at the relevant input voltage/frequency combination foreach market in which they will be sold and promoted as ENERGY STAR.

Customer Software and Management Service Pre-Provisioning
If a manufacturing Partner is hired by a customer to load a custom image on an ENERGY STAR
certified computer, the Partner shall take the following steps:i.

Inform the customer that their product may not meet ENERGY STAR with the custom image.
A sample notification letter is available on the ENERGY STAR Web site.

ii.

Encourage the customer to test the product for ENERGY STAR compliance.

iii. Encourage the customer, should the product no longer meet ENERGY STAR, to make use of
EPA's free technical assistance that can assist with Power Management performance, which
can be found at www.energystar.gov/fedofficeenergy.

5 USER INTERFACE
5.1.1

Manufacturers are encouraged to design products in accordance with the user interface standard
IEEE 1621: Standard for User Interface Elements in Power Control of Electronic Devices
Employed in Office/Consumer Environments. For details, see http://eetd.LBL.gov/Controls.

6 EFFECTIVE DATE
6.1.1

Effective Date: The Version 8 ENERGY STAR Computers specification shall take effect October
15, 2020. To be ENERGY STAR certified, a product model shall meet the ENERGY STAR
specification in effect on its date of manufacture. The date of manufacture is specific to each unit
and is the date on which a unit is considered to be completely assembled.

6.1.2

Future Specification Revisions: EPA reserves the right to change this specification should
technological and/or market changes affect its usefulness to consumers, industry, or theenvironment. In keeping with current policy, revisions to the specification are arrived at throughstakeholder discussions. In the event of a specification revision, please note that the ENERGYSTAR certification is not automatically granted for the life of a product model.

7 CONSIDERATIONS FOR FUTURE REVISIONS
7.1.1

Active Mode: EPA will continue to monitor developments in test methodology that addresses
active mode, where the computer is actively performing tasks, and assess whether thesemeasurements warrant inclusion into the ENERGY STAR Computers specification.

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7.1.2

Energy Efficient Ethernet: EPA intends to require that EEE is enabled as-shipped for all 1Gb/s
or faster Ethernet ports provided in computer products in the next revision of the ENERGY STAR
Computers specification.

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APPENDIX A:
Sample Calculations
I.

Desktop, Integrated Desktop, Notebook Computers: Below is a sample TEC calculation intended
to show how levels for compliance are determined based on functional adders and operational modemeasurements.
Following is a sample ETEC evaluation for a 2.0 GHz, dual core Notebook with Switchable Graphics,
8 GB Memory, and 1 hard disk drive (HDD).
A) Measure values using the ENERGY STAR Computers Test Method:
1) Off Mode = 0.5 W
2) Sleep Mode = 1.0 W
3) Long Idle State = 6.0 W
4) Short Idle State = 10.0 W
B) Determine the proxy support provided by the operating system and network card. This is amanufacturer-reported parameter.
1) On Mac computers, “Wake for network access” enabled within the Energy Saver/Power
Adapter Preferences signifies Base Capability or better.
2) On Windows computers, “ARP Offload” or “NS Offload” or similar enabled within the
Advanced Properties of the Network Interface Card (accessed through the Device Manager)
signifies Base Capability or better. OEM can provide further guidance on how to confirm
Proxy Support
C) Calculate ETEC from power measurements and mode weightings—this example assumes no
Proxy Support/Conventional Weightings:
TOFF

25%

TSLEEP

35%

TLONG_IDLE

10%

TSHORT_IDLE

30%

8760

1) 𝐸𝑇𝐸𝐶 =× (𝑃𝑂𝐹𝐹 × 𝑇𝑂𝐹𝐹 + 𝑃𝑆𝐿𝐸𝐸𝑃 × 𝑇𝑆𝐿𝐸𝐸𝑃 + 𝑃𝐿𝑂𝑁𝐺_𝐼𝐷𝐿𝐸 × 𝑇𝐿𝑂𝑁𝐺_𝐼𝐷𝐿𝐸 + 𝑃𝑆𝐻𝑂𝑅𝑇_𝐼𝐷𝐿𝐸 ×
1000
𝑇𝑆𝐻𝑂𝑅𝑇_𝐼𝐷𝐿𝐸 )2) 𝐸𝑇𝐸𝐶 =

8760
1000

× (0.5 W × 25% + 1.0 W × 35% + 6.0 W × 10% + 10.0 W × 30%)

3) ETEC = 35.7 kWh / yearD) Determine which Base TEC allowance applies based on graphics capability and performance
score: P = [# of CPU cores] × [CPU clock speed (GHz)] = 2×2 GHz = 4.
Table 8: Base TEC (TECBASE) Allowances for Notebooks
CategoryName
1

Notebook
Performance
Score, Pv
2<P≤8

Base
Allowance
8.0E) Determine which Functional Adder Allowances apply:

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1) Memory: 8 GB installed, so a TECMEMORY allowance of 2.4 + (0.294 × 8) = 4.75 kWhapplies2) Discrete Graphics? No, therefore TECGRAPHICS allowance does not apply.
3) Switchable Graphics? Yes, but TECSWITCHABLE allowance does not apply to Notebooks.
4) Energy Efficient Ethernet (EEE)? Yes, but TECEEE allowance does not apply to Notebooks.
5) Storage? No, the notebook has only one hard disk drive, so no storage allowance applies.
6) Integrated Display? Yes, and assuming a non-enhanced performance, 14 inch display withan area of 83.4 square inches and a resolution of 1.05 megapixels, a TECINT_DISPLAY
allowance of 8.76 ×0.30 × (1+EP) × (0.43×r + 0.0263×A) = 8.76 ×0.30 × (0.43×1.05 MP+
0.0263×83.4 in2) = 6.95 kWh applies.
F) Calculate ETEC_MAX:
1) ETEC_MAX = 8.0 kWh + 4.75 kWh + 6.95 kWh2) ETEC_MAX = 19.7 kWh/yr
G) Compare ETEC to the ETEC_MAX to determine if the model qualifies:
35.7 kWh/yr > 19.7 kWh/yr
Therefore, the Notebook does not meet ENERGY STAR requirements.

II. Workstations: Below is a sample PTEC calculation for a Workstation with 2 hard drives and no Energy
Efficient Ethernet capability.
A) Measure values using the ENERGY STAR Computers Test Method:
1) Off Mode = 2 W
2) Sleep Mode = 4 W
3) Long Idle State = 50 W
4) Short Idle State = 80 W
5) Max Power = 180 W
A) Note number of Hard Drives installed: Two hard drives installed during test.
B) Calculate PTEC from power measurements and mode weightings using Equation 4:
TOFF
10%

TSLEEP
35%

TLONG_IDLE
20%

TSHORT_IDLE35%1) PTEC = (10% × POFF + 35% × PSLEEP + 20% × PLONG_IDLE + 35% × PSHORT_IDLE)
2) PTEC = (10% × 2 W + 35% × 4 W + 20% × 50 W + 35% × 80 W)
3) PTEC = 39.6 W
C) Calculate the PTEC_MAX requirement using Equation 5:
1) PTEC_MAX = 0.28×(PMAX + NHDD×5) + 8.76×PEEE×(TSLEEP + TLONG_IDLE + TSHORT_IDLE)
2) PTEC_MAX = 0.28×(180+ 2×5) + 8.76×0×(TSLEEP + TLONG_IDLE + TSHORT_IDLE)
3) PTEC_MAX = 53.2 + 0
D) Compare PTEC to the ENERGY STAR levels to determine if the model qualifies:

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39.6 W ≤ 53.2 W
Therefore, the Workstation meets ENERGY STAR requirements.

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ENERGY STAR® Program Requirements
Product Specification for
Computers
Final Test Method
Rev. July-2022

1 OVERVIEW
The following test method shall be used for determining product compliance with requirements in the
ENERGY STAR Specification for Computers.

2 APPLICABILITY
ENERGY STAR test requirements are dependent upon the feature set of the product under evaluation.
The following guidelines shall be used to determine the applicability of each section of this document:▪

The procedure in Section 6 shall be conducted on all eligible products that are covered under thescope as defined in Section 2 of the ENERGY STAR Eligibility Criteria for Computers.

▪

The procedure in Section 7 shall be conducted only on eligible Workstation Computer products.

3 DEFINITIONS
Unless otherwise specified, all terms used in this document are consistent with the definitions in the
ENERGY STAR Specification for Computers.

4 TEST SETUP
4.1 Test Setup and Instrumentation
Test setup and instrumentation for all portions of this procedure shall be in accordance with therequirements of International Electrotechnical Commission (IEC) standard, IEC 62301, “Household
Electrical Appliances – Measurement of Standby Power” Edition 2.0, 2011-01, Section 4, “General
Conditions for Measurements”, unless otherwise noted in this document. In the event of conflicting
requirements, the ENERGY STAR test method shall take precedence.
A) Input Power: Products intended to be powered from alternating current (ac) mains shall be connected
to a voltage source appropriate for the intended market, as specified in Table 1 and Table 2.

ENERGY STAR Program Requirements for Computers – Final Test Method (Rev. July-2022)

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Table 1: Input Power Requirements for Products with
Nameplate Rated Power Less Than or Equal to 1500 watts (W)Voltage

VoltageTolerance

Maximum
Total
Harmonic
Distortion

Frequency

Frequency
Tolerance

North America, Taiwan

115 volts(V) ac+/- 1.0 %2.0 %60 hertz(Hz)+/- 1.0 %Switzerland

230 V ac+/- 1.0 %

2.0 %

50 Hz

+/- 1.0 %Japan

100 V ac+/- 1.0 %2.0 %50 Hz or
60 Hz+/- 1.0 %MarketTable 2: Input Power Requirements for Products with
Nameplate Rated Power Greater Than 1500 W

Voltage

VoltageTolerance

Maximum
Total
Harmonic
Distortion

Frequency

Frequency
Tolerance

North America, Taiwan

115 V ac+/- 4.0 %

5.0 %

60 Hz

+/- 1.0 %Europe, Australia, New Zealand

230 V ac+/- 4.0 %

5.0 %

50 Hz

+/- 1.0 %Japan

100 V ac+/- 4.0 %5.0 %50 Hz or
60 Hz+/- 1.0 %MarketB) Ambient Temperature: Ambient temperature shall remain between 18 C and 28 C, inclusive, for theduration of the test.
C) Relative Humidity: Relative humidity shall remain between 10% and 80%, inclusive, for the duration of
the test.
D) Light Measuring Device (LMD): All LMDs shall meet the following specifications:
1) Accuracy: ± 2% (± 2 digits) of the digitally displayed value; and
2) Acceptance Angle: 3 degrees or less.
The overall tolerance of LMDs is found by taking the absolute sum of 2%of the targeted screen
luminance and a 2 digit tolerance of the displayed value’s least significant digit. For example, if thescreen luminance value is 90 candela per meter squared (cd/m2) and the LMD’s least significant digit
is a tenth of one cd/m2, 2% of 90 cd/m2 would be 1.8 cd/m2 and a 2 digit tolerance of the leastsignificant digit would be 0.2 cd/m2. Thus, the displayed value would need to be 90 ± 2 cd/m2 (1.8
cd/m2 + 0.2 cd/m2).
Note: The term “nit” is sometimes used instead of the official SI unit cd/m2. One nit is equivalent to
one cd/m2.
E) Power Meter: Power meters shall possess the following attributes:
1) Crest Factor:a) An available current crest factor of 3 or more at its rated range value; andb) A bound on the current range of 10 milliamperes (mA) or less.
2) Minimum Frequency Response: 3.0 kilo-hertz (kHz)3) Minimum Resolution:a) 0.01 W for measurement values less than 10 W;

ENERGY STAR Program Requirements for Computers – Final Draft Test Method (Rev. July-2022)

Page 2 of 9b) 0.1 W for measurement values from 10 W to 100 W; andc) 1.0 W for measurement values greater than 100 W.
4) Measurement Accuracy: Measurement uncertainty as introduced by the instrument that measures
the input power to the unit under test (UUT), including any external shunts.
a) Power measurements with a value greater than or equal to 0.5 W shall be made with anuncertainty of less than or equal to 2% at the 95% confidence level.
b) Power measurements with a value less than 0.5 W shall be made with an uncertainty of lessthan or equal to 0.01 W at the 95% confidence level.

5 TEST CONDUCT
5.1 Guidance for Implementation of IEC 62623
The Test Conduct shall be carried out according to the requirements in IEC 62623, “Desktop andNotebook Computers – Measurement of Energy Consumption” Edition 1.0, 2012-10 (IEC 62623 Ed. 1.0,
2012-10) reference with the following guidance.

A) Thin Clients and Workstations shall be configured in a manner identical to Desktops (non-integrated)
unless otherwise specified. Slates/Tablets shall be configured in a manner identical to Notebooks
unless otherwise specified. Portable All-In-One Computers shall be configured in a manner identicalto Integrated Desktops unless otherwise specified.
1) Thin Clients shall run intended terminal/remote connection software during all tests.
B) Wake on LAN (WoL) settings shall be in as shipped condition for testing Sleep Mode and Off Mode.
C) Notebooks and Slates/Tablets shall be tested using the external power supply (EPS) shipped with the
product. If the UUT is designed with the intention of utilizing an EPS that is 30W or less, but does notinclude a pre-packaged EPS, then test the UUT as follows:
1) Test the UUT with an EPS sold and recommended by the manufacturer; or,2) If the manufacturer does not recommend and EPS that it sells, test the UUT with an EPS
recommended by the manufacturer in the manufacturer materials; or,3) If the manufacturer does not recommend any EPS, test the UUT with an EPS that meets theparameters specified by the UUT manufacturer and minimally complies with the applicableFederal energy conservation standard. The input voltage shall be within ±1 percent of the UUT
manufacturer specified voltage.
D) For models that do not offer a Sleep Mode enabled by default, Section 6.2 shall measure power in thelowest-latency user-activated mode or state that preserves machine state and is enabled by default.
1) If no such state separate from Long Idle State or Off Mode exists, the measurement in
Section 6.2 shall be skipped.
E) For Long Idle Mode Testing (Section 6.3), the UUT shall be allowed no more than 20 minutes fromthe point of ceased user input before measurements must be started. If any default settings cause the
UUT to enter Long Idle after 20 minutes, begin taking measurements when the UUT has reached the
20 minute mark. Display sleep settings shall be set to default for Long Idle Mode Testing.

ENERGY STAR Program Requirements for Computers – Final Draft Test Method (Rev. July-2022)

Page 3 of 9F) For Alternative Low Power Mode Testing (Section 6.3), the UUT shall be allowed no more than 20
minutes from the point of ceased user intput before measurements must be started. If any default
settings cause the UUT to enter the Alternative Low Mode after 20 minutes, begin taking
measurements when the UUT has reached the 20 minute mark. Display sleep settings shall be set todefault for Alternative Low Power Mode Testing. When conducting the test in section 6.3, replace all
instances of “Long Idle Mode” with “Alternative Low Power Mode.”, and apply the definition of
Alternative Low Power Mode from the ENERGY STAR Specification for Computers.
G) For Short Idle Mode Testing (Section 6.4), the UUT shall be allowed no more than five minutes fromthe point of ceased user input before measurements must be taken. Display sleep settings shall bedisabled for Short Idle Mode Testing. If any other default settings cause the UUT to exit Short Idle
during the measurement time, extend the settings so that the UUT remains in short idle for theduration of the measurement.
Additionally, only for notebook computers that demonstrate cyclical battery charging patterns, extend
the short idle test long enough to capture the energy consumption over one or more complete cycles.
The extended test shall be conducted by keeping the unit in short idle through minimal user input
such as moving the mouse or pressing a key that does not perform any action (e.g. shift, ctrl, tab,etc). The UUT must remain in short idle during the entire time of the extended test.
H) Desktops, Integrated Desktops, Notebook Computers, Portable All-In-One Computers , andSlates/Tablets shall be tested for Idle, Sleep, and Off Mode with Full Network Connectivity(“Proxying”) features using the as shipped setting.
I)

Celluar network connections shall be disabled for testing. Additionally, Bluetooth should be left asshipped.

J) If the UUT exhibits any cycling behavior and the normal measurement time would not capture one ormore complete cycles, measure the long idle, alternative low power mode, sleep mode, and off modemeasurement using an extended measurement capturing one or more full cycles per IEC 62301,
section B.2.3.
K) Any secondary storage drive may have the power management features enabled during short idle aslong as those power management features are enabled by default. A secondary storage drive refers
to any drive that does not contain the operating system software.

5.2 Preparing Display Luminance of Notebooks, Integrated Desktops,
Slates/Tablets and Portable All-In-One ComputersA) Before performing any tests, disable display dimming, display Sleep Mode, Computer Sleep Mode,and automatic brightness control (ABC) in the Computer settings. Document all settings that werechanged from the default configuration.
1) If ABC cannot be disabled, position a light source such that at least 300 lux directly enters theABC sensor.
B) Display the three vertical bar video signal as defined in section 3.2.1.3 of IEC 60107-1, “Methods ofmeasurement on receivers for television broadcast transmissions – Part 1: General conditions –Measurements at radio and video frequencies” Edition 3.0, 1997 (IEC 60107-1 Ed. 3.0, 1997). The
three bar image shall be configured using the default image display application.
C) Devices with a cold cathode fluorescent lamp (CCFL) backlight shall warm-up for at least 30 minutes.
All other displays shall warm-up for at least 5 minutes.
D) With the LMD, measure the luminance in the center of the display.
E) Calibrate the UUT display brightness to the closest brightness setting that is at least 90 cd/m 2 for
Notebook Computers, at least 150 cd/m2 for Integrated Desktop Computers, Portable All-In-One
Computers and Slates/Tablets. If the UUT’s brightest setting cannot achieve the specified brightness,then set the UUT display to the brightest setting.

ENERGY STAR Program Requirements for Computers – Final Draft Test Method (Rev. July-2022)

Page 4 of 9

F) The display shall be configured with the ENERGY STAR test image, which can be found here1. For
Desktops, Integrated Desktops, Notebook Computers and Portable All-In-One Computers it may be
set as the “desktop background” (wallpaper) or shown via an image display application. The image
shall be scaled to completely fill the display area. For Slates/Tablets, the display shall be configured
with the default image display application.
G) Optional setting for units with multiple integrated displays. Configure all displays in the same way
using the previous steps. The displays do not have to be configured sequentially (i.e. warmup times
can be done simultaneously for all displays). For notebook computers, all displays must be set to theclosest brightness setting that is at least 90 cd/m2 for every display. For Integrated Desktop
Computers, Portable All-In-One Computers and Slates/Tablets, all displays must be set to the closest
brightness setting that is at least 150 cd/m2 for every display.
H) For all testing specified in Section 6, the UUT shall not be rebooted or restarted until after the power
measurements for Long Idle Mode and Short Idle Mode tests are taken.
I)

Slate/Tablet and Portable All-In-One Computers shall be tested with a docking station only if it isshipped with the product and is the only way to power the device mains.

5.3 Preparing External Displays for Desktops
A) Display Connection Priority
1) If the UUT has a port that supports switchable graphics capable of automatic switching, use thatport.
2) If a discrete GPU is installed, connect to that GPU, except for where it conflicts with Section 5.3(A)(1) in this test method.
3) If no discrete or automatically switchable GPU is installed, choose a connection to an integratedGPU.
4) If multiple ports meet the requirements in Section 5.3 (A)(1) to 5.3 (A)(3) of this test method, testwith the first available interface from the list below.
External Display Connection Priorityi.

DisplayPort

ii.

HDMI

iii. DVI
iv. VGAv.

Other (i.e. Thunderbolt 3,
Composite Video, etc.)

B) Display Resolution:
An external monitor used in the testing of the UUT shall have a minimum native resolution of
1920X1080 pixels with progressive scanning (1080p). The UUT operating system shall be set tooperate at a minimum of 1080p.

1 https://www.energystar.gov/ia/partners/images/ComputerTestingImage.bmp

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6 TEST PROCEDURES FOR ALL PRODUCTS
6.1 UUT Preparation
UUT preparation shall be performed according to IEC 62623, Ed.1.0, 2012-10, Section 5.2: Test Setup;with the additional guidance in Section 5 of this document.

6.2 Sleep Mode Testing
Sleep Mode power shall be measured according to IEC 62623, Ed.1.0, 2012-10, Section 5.3.3:
Measuring Sleep Mode; with the additional guidance in Section 5 of this document.

6.3 Long Idle Mode TestingLong Idle Mode power shall be measured according to IEC 62623, Ed.1.0, 2012-10, Section 5.3.4:
Measuring Long Idle Mode; with the additional guidance in Section 5 of this document.

6.4 Short Idle Mode Testing
Short Idle Mode power shall be measured according to IEC 62623, Ed.1.0, 2012-10, Section 5.3.5:
Measuring Short Idle Mode; with the additional guidance in Section 5 of this document.

6.5 Off Mode Testing
Off Mode power shall be measured according to IEC 62623, Ed.1.0, 2012-10, Section 5.3.2: Measuring
Off Mode; with the additional guidance in Section 5 of this document.

6.6 Additional Testing For Reporting
For Notebook Computers, repeat the Short Idle test with the display brightness set to the closest settingthat is at least 150 cd/m2 for all displays.

7 TEST PROCEDURES FOR WORKSTATIONS
7.1 Maximum Power Test
The maximum power for Workstations is found by the simultaneous operation of two industry standard
benchmarks: Linpack to stress the core system (e.g., processor, memory, etc.) and SPECviewperf®
(latest available version for the UUT) to stress the system’s Graphics Processing Unit (GPU). This test
shall be repeated three times on the same UUT, and all three measurements shall fall within a ± 2%
tolerance relative to the average of the three measured maximum power values. The average powershould be used for qualification and/or TEC calculations.

Note: Workstations may certify configurations using Microsoft Windows® OS as a proxy for Linux for the
maximum power test, as SPEC does not currently support a version of SPECviewperf® capable ofrunning on the Linux OS.

Additional information on these benchmarks, including free downloads, can be found at the following
locations as specified in Table 3.

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Table 3: Benchmark Information for Maximum Power Test

BenchmarkWebsite

Linpack

http://www.netlib.org/linpack/

SPECviewperf

http://www.spec.org/benchmarks.html#gpc

A) UUT Preparation:
1) Connect a power meter capable of measuring true power to an ac line voltage source set to theappropriate voltage/frequency combination for the test. The meter shall have all the attributes
listed in Section 4.1 E). The meter shall also store and output the maximum power measurement
reached during the test or be capable of another method of determining maximum power.
2) Plug the UUT into the measurement power outlet on the meter. No power strips or uninterruptible
power supply (UPS) units shall be connected between the meter and the UUT.
3) Record the ac voltage.
4) Boot the UUT and, if not already installed, install Linpack and SPECviewperf as indicated on theabove Websites.
5) Set Linpack with all the defaults for the given architecture of the UUT and set the appropriate
array size “n” for maximizing power draw during the test.
6) Ensure all technical guidelines relevant to running the benchmark set by the Standard
Performance Evaluation Corporation (SPEC) organization for running SPECviewperf have beenmet.
7) For additional information regarding Linpack setup, see Section 9.1 Typical Linpack Starting
Parameters.
B) Maximum Power Testing:1) Set the meter to begin accumulating true power values at a rate greater than or equal to one
reading per second, and begin taking measurements.
2) Run SPECviewperf and as many simultaneous instances of Linpack as needed to fully stress thesystem. Recommended setup information can be found in Section 9.1 C).
3) Accumulate power values until SPECviewperf and all Linpack instances have completed running.
Record the maximum power value attained during the test.
4) The following data shall also be recorded:a) Value of “n” (the array size) used for Linpack;b) Number of simultaneous copies of Linpack run during the test;c) Version of SPECviewperf run for test;d) All compiler optimizations used in compiling Linpack and SPECviewperf; ande) A precompiled binary for end users to download and run both SPECviewperf and Linpack.
These can be distributed either through a centralized standards body such as SPEC, by theoriginal equipment manufacturer (OEM), or by a related third party.

7.2 Benchmark Test
The benchmark test shall be performed by running both benchmarks listed below separately. The UUT
shall be rebooted before testing with each benchmark. Additional information on these benchmarks,
including downloads, can be found at the following locations specified in Table 4. All testing shall be
performed with the latest available version of the benchmarks.

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Table 4: Information for Benchmark Testing

BenchmarkWebsite

Linpack

http://www.netlib.org/linpack/

SPECviewperf

http://www.spec.org/benchmarks.html#gpc

A) UUT Preparation:
1) The UUT shall be setup identical to Step 1) through Step 4) of Section 7.1 A)
2) If not already installed, install the benchmark as indicated on the websites listed in Table 4.
3) Configure the benchmark as specified in Section 7.2 B).
4) Time Measurement: Time measurements may be performed with a standard stopwatch or othertime keeping device with a resolution of at least 1 second.
B) Benchmark Configurations:1) Linpacka) Configure the Linpack settings identically to the maximum power workstation test (e.g. Follow
Step 5) and Step 7) of Section 7.1 A)).
b) Run as many simultaneous instances of Linpack as needed to fully stress the system.
Recommended settings would be to set the number of simultaneous instances of Linpackequal to the number of logical and/or physical CPU cores of the system.
2) SPECviewperfa) Configure the settings identically to the maximum power workstation test (e.g. Follow Step 6)of Section 7.1 A)).
C) Benchmark Testing:1) Set the meter to begin accumulating true power values at a rate of greater than or equal to one
reading per second and begin power and time measurement.
2) Execute the benchmark.
3) Stop time measurement and accumulate power values for the entire duration of the benchmarkrun.
4) The following data shall be reported:a) Linpacki.

Value of “n” (the array size) used for Linpack;ii.

Number of instances of Linpack simultaneously run on the system;iii. All compiler options used in compiling Linpack;iv. Energy consumed over the duration of the test; andv.

Linpack output file in text format which contains system performance in floating point
operations per second (Flops) in addition to other Linpack parameters (e.g. number oftests, problem size, etc.).

b) SPECviewperfi.

Version of SPECviewperf used;ii.

All compiler optimizations used in compiling SPECviewperf;

iii. Duration of the test;
iv. Energy consumed over the duration of the test; andENERGY STAR Program Requirements for Computers – Final Draft Test Method (Rev. July-2022)

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All files and folders present in the Result folder of SPECviewperf suite shall be reported.

8 REFERENCES
A) IEC 62301 Edition 2.0 2011-01, Household electrical appliances – Measurement of standby power.
B) IEC 60107-1 Edition 3.0 1197-04, Methods of measurement on receivers for television broadcast
transmissions – Part 1: General Considerations – Measurements at radio and video frequencies.
C) IEC 62623 Edition 1.0 2012-10, Desktop and notebook computers – Measurement of energy
consumption

9 APPENDIX: BENCHMARK PARAMETERS
9.1 Typical Linpack Starting Parameters
Below are some typical starting values for the use of Linpack for testing Workstations. These values arestarting points and not meant to be binding. The tester is free to use the settings most advantageous totheir UUT. Platform and Operating System (OS) will have a significant impact on the applicability of thesestarting values. The below assumes Linux as the test OS.
A) Number of equations (problem size): See Equation.
B) Leading dimensions of array: See Equation.
The matrix size (the combination of number of equations and leading dimensions of array) should be
the maximum size that will fit in the Random Access Memory (RAM) on the machine.
This AWK script will calculate matrix size on a Linux machine:awk 'BEGIN {
printf "Maximum matrix dimension that will fit in RAM on this machine: "}/^MemTotal:/ {print int(sqrt(($2*1000)/8)/1000) "K"}' /proc/meminfo
Use the output of this to determine what matrix size to input for both the "Number of equations" and"Leading dimensions of array" inputs. The “Number of equations” will be equal to the printed output.
The “Leading dimensions of the array” will be the output rounded up to the nearest multiple of eight.
This calculation can be most easily calculated by taking the memory size, in bytes, of the UUT(denoted as m) and substituting m in Equation 1.

m  1000
81000
Equation 1: Memory Size Calculation

C) Number of trials: c - 1 where c equals the number of logical and/or physical CPU cores of the system.
The tester needs to determine which
 is more advantageous for the unit. The -1 leaves one core open
for use by SPECviewperf.
D) Data alignment value: Typically four with Linux systems. The best value to use is the page size
boundary of the OS.

ENERGY STAR Program Requirements for Computers – Final Draft Test Method (Rev. July-2022)

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