UNITED STATES ENVIRONMENTAL PROTECTION AGENCYWASHINGTON, D.C. 20460
OFFICE OF
AIR AND RADIATION

April 12, 2023
Dear ENERGY STAR® Computer Server Partner or Other Interested Stakeholder,
The U.S. Environmental Protection Agency (EPA) is pleased to share the final Version 4.0 ENERGYSTAR Computer Server Specification. EPA would like to thank the many stakeholders who have invested
time and effort to contribute feedback and data that has informed this product specification process.
These Version 4.0 requirements will take effect on January 12, 2024. This letter provides highlights of thenew requirements and outlines the transition process.
The Version 4.0 specification will recognize the top performing computer server products on the market.
ENERGY STAR certified computer servers with power management enabled will use, on average,
approximately 38% less energy than standard computer. If all computer servers sold in the United States
were ENERGY STAR certified, the cost savings would grow to over $4 billion each year and more than
74 billion pounds of greenhouse gas emissions would be prevented, equivalent to the emissions of nearly
8 million vehicles.
EPA received limited comments in response to the final draft specification focused on improving clarity,
which EPA has addressed fully in the final document. Specifically, EPA made very modest clarifications tothe definitions for Storage Heavy Servers, Auxiliary Processing Accelerator (APA) and High and Low End
Performance Configurations. New definitions for Field Programmable Gate Array and Data Processing
Units were included to support the changes to the APA definition. In addition, the footnote related topower supplies was amended to clarify that the power supply values used for servers should be at230V/60Hz rather than 115V/60Hz. Finally, there were small changes made to the scope, to exclude
products that would never be sold without an APA.
Version 4.0 Transition Timeline and Next StepsEPA shares partners’ desire for a smooth transition from one ENERGY STAR specification to the next sothat consumer expectations are met and ENERGY STAR labeled products fully meet the newrequirements upon their effective date. With this in mind, EPA has established the following timeline:•••

Effective immediately, manufacturers may elect to have their Certification Body (CB) certify
eligible products to the Version 4.0 requirements.
o CBs must upload required SERT files specified in Section 4.1.2.v of the specification toEPA in a location to be determined which will be shared with CBs upon the release of thefinal QPX form.
After August 30, 2023, CBs will be instructed to stop certifying new product submittals to Version
3.0. Note, however, that existing certifications to V3.0 will remain valid for the purposes ofENERGY STAR certification until January 12, 2024.
Any computer server manufactured as of January 12, 2024, must meet the Version 4.0
requirements to bear the ENERGY STAR mark. All certifications of products to the Version 3.0
specification will be invalid for purposes of ENERGY STAR and CBs will only submit productmodels certified to Version 4.0 to EPA.

On behalf of EPA, I would like to thank all stakeholders who provided feedback during this specification
revision process and I look forward to working with you as you certify and market your ENERGY STAR
certified computer servers. Please contact me at Fogle.Ryan@epa.gov or 202-343-9153 or John Clinger

at John.Clinger@icf.com or 215-967-9407 with questions or concerns. For any other computer server
related questions, please contact servers@energystar.gov. Thank you for your continued support of theENERGY STAR program.
Sincerely,Ryan Fogle
EPA Manager, ENERGY STAR for IT and Data Center Products
Enclosures:
ENERGY STAR Version 4.0 Final Specification
ENERGY STAR Version 4.0 Data and Analysis Package