Abstract:
An adjustable heat sink which allows factory, service, or customers to adjust the width of the heat sink to take advantage of some or all available unpopulated DIMM space to optimize cooling and performance. Such an adjustable heat sink addresses many of the limitations of other heat sinks and is advantageous for reducing part numbers within a platform and across platforms. Such an adjustable heat sink also simplifies field upgrades when either adding or removing populated DIMMs to an information handling system thus enhancing performance without a need to change CPU Heat sinks.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates in general to the field of heat sinks and more particularly to adjustable heat sinks which support multiple platforms and system configurations. 
         [0003]    2. Description of the Related Art 
         [0004]    As the value and use of information continues to increase, individuals and businesses seek additional ways to process and store information. One option available to users is information handling systems. An information handling system generally processes, compiles, stores, and/or communicates information or data for business, personal, or other purposes thereby allowing users to take advantage of the value of the information. Because technology and information handling needs and requirements vary between different users or applications, information handling systems may also vary regarding what information is handled, how the information is handled, how much information is processed, stored, or communicated, and how quickly and efficiently the information may be processed, stored, or communicated. The variations in information handling systems allow for information handling systems to be general or configured for a specific user or specific use such as financial transaction processing, airline reservations, enterprise data storage, or global communications. In addition, information handling systems may include a variety of hardware and software components that may be configured to process, store, and communicate information and may include one or more computer systems, data storage systems, and networking systems. 
         [0005]    Due to physical form factor limitations, and overall chassis power and cooling limitations, dense information handling system platforms such as blade server platforms, often cannot simultaneously support maximum capacity, maximum performance, and maximum features. Reasonable configuration limitations (that minimize the restrictions) of simultaneously populated processors such as central processing units (CPUs), dual inline memory modules (DIMMs), Drives, input output (IO) Adapters, etc. address the needs of the majority of customers. However, optimizing the supportable configurations often requires design and or cost tradeoffs, or increased solution complexity. 
         [0006]    One such tradeoff is the physical volume and air-path width of the heat sinks such as CPU heat sinks vs. a number of populated DIMMs located in proximity to the CPU. Another design consideration relates to supportable CPU thermal design power (TDP). Due to height constraints (which are often approximately 1 unit (1U) of height), often with known blade servers the width of the CPU heat sink is increased to accommodate higher power CPUs. For example, CPUs with TDP &lt;=80W may be cooled with a relatively small heat sink, CPUs with TDP between 95-120W with a larger/wider heat sink, and CPUs with TDPs &gt;=130W may require an even larger/wider heat sink to maintain maximum CPU performance (e.g., without thermal throttling). 
         [0007]    While growing the CPU heat sink width allows higher power CPUs to be cooled, the increased heat sink width often occupies the physical volume requirements of non-CPU components, typically DIMM slots. Due to signal integrity requirements, it is desirable that DIMMs such as DDR3/DDR4 DIMMs be populated very close to the CPU and memory controller such as an integrated memory controller (iMC), and DIMMs be routed serially with a short lead-in to the first DIMM (typically &lt;4-5″) and minimal DIMM to DIMM spacing within a double data rate (DDR) channel (typically 0.330″ to 0.400″). It is also desirable that channels be routed without interleaving of DIMMs from other channels, which increases DIMM to DIMM spacing reflections and degrades maximum achievable DDR frequency. 
       SUMMARY OF THE INVENTION 
       [0008]    In accordance with the present invention, in one embodiment, an adjustable heat sink is provided which allows factory, service, or customers to adjust the width of the heat sink to take advantage of some or all available unpopulated DIMM space to optimize cooling and performance. Such an adjustable heat sink addresses many of the limitations of other heat sinks and is advantageous for reducing part numbers within a platform and across platforms. Such an adjustable heat sink also simplifies field upgrades when either adding or removing populated DIMMs to an information handling system thus enhancing performance without a need to change CPU Heat sinks. In alternate embodiments, the adjustable heat sink may be designed to take advantage of some or all available unpopulated space of other system components or assemblies. 
         [0009]    More specifically, the adjustable heat sink comprises a main portion as well as an extendable portion. The main portion further comprises a heat sink base as well as a heat sink fin array coupled to the heat sink base. The extendable portion comprises an adjustable heat sink base as well as a heat sink fin array coupled to the adjustable head sink base. The main portion and the extendable portion are coupled via an adjustment mechanism which is thermally conductive. In certain embodiments, adjustment mechanism comprises heat pipes. Additionally in certain embodiments, the heat pipes are fixed to one of the main portion and the extendable portion and extend into the other of the main portion and the extendable portion via apertures which allow the other of the main portion and the extendable portion to slide along the heat pipes. Additionally, in certain embodiments, the adjustable heat sink further comprises another extendable portion. In certain embodiments, the extendable portion and the another extendable portion are positioned on opposite sides of the main portion. Additionally, in certain embodiments, the fin array comprises a stacked fin array. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0010]    The present invention may be better understood, and its numerous objects, features and advantages made apparent to those skilled in the art by referencing the accompanying drawings. The use of the same reference number throughout the several figures designates a like or similar element. 
           [0011]      FIG. 1  shows a generalized illustration of components of an information handling system as implemented in the method and apparatus of the present invention. 
           [0012]      FIG. 2  shows an information handling system motherboard along with a heat sink in accordance with one aspect of the present invention. 
           [0013]      FIG. 3  shows a perspective view of a heat sink in accordance with one aspect of the present invention. 
           [0014]      FIG. 4  shows an information handling system motherboard along with another configuration of a heat sink in accordance with one aspect of the present invention. 
           [0015]      FIG. 5  shows an information handling system motherboard along with another configuration of a heat sink in accordance with one aspect of the present invention. 
           [0016]      FIG. 6  shows a perspective view of a heat sink in accordance with one aspect of the present invention. 
           [0017]      FIG. 7  shows a perspective view of a heat sink in accordance with another aspect of the present invention. 
           [0018]      FIG. 8  shows a perspective view of a heat sink in accordance with another aspect of the present invention. 
           [0019]      FIG. 9  shows a perspective view of a heat sink in accordance with another aspect of the present invention. 
           [0020]      FIG. 10  shows a perspective view of a heat sink in accordance with another aspect of the present invention. 
       
    
    
     DETAILED DESCRIPTION 
       [0021]      FIG. 1  is a generalized illustration of components of an information handling system  100  as implemented in the method and apparatus of the present invention. The information handling system  100  includes a processor (e.g., central processor unit or “CPU”)  102 , input/output (I/O) devices  104 , such as a display, a keyboard, a mouse, and associated controllers, a hard drive or disk storage  106 , and various other storage subsystems  108 . The information handling system  100  likewise includes memory  112 , including volatile and non-volatile memory which is interconnected to the foregoing via one or more buses  114 . Memory  112  further comprises operating system (OS)  116 . 
         [0022]    For purposes of this disclosure, an information handling system may include any instrumentality or aggregate of instrumentalities operable to compute, classify, process, transmit, receive, retrieve, originate, switch, store, display, manifest, detect, record, reproduce, handle, or utilize any form of information, intelligence, or data for business, scientific, control, or other purposes. For example, an information handling system may be a personal computer, a network storage device, or any other suitable device and may vary in size, shape, performance, functionality, and price. The information handling system may include random access memory (RAM), one or more processing resources such as a central processing unit (CPU) or hardware or software control logic, ROM, and/or other types of nonvolatile memory. Additional components of the information handling system may include one or more disk drives, one or more network ports for communicating with external devices as well as various input and output (I/O) devices, such as a keyboard, a mouse, and a video display. The information handling system may also include one or more buses operable to transmit communications between the various hardware components. 
         [0023]    Referring to  FIG. 2 , an information handling system motherboard  210  along with an adjustable heat sink  212  is shown. Some or all of the processor (e.g., central processor unit or CPU)  102 , input/output (I/O) devices  104  and various other storage subsystems  108  may be coupled to the motherboard  210 . Additionally, the motherboard includes memory sockets  214 , such as DIMM sockets, into which memory such as memory  112  may be coupled. In certain embodiments, the heat sink  212  is thermally coupled to the processor  102 . 
         [0024]    More specifically, in certain embodiments the information handling system motherboard includes provision for two channels of DIMMs on each side of a CPU and three DIMM slots per channel (e.g., six DIMM slots per side and twelve DIMM slots per CPU). In the configuration shown in  FIG. 2 , the adjustable heat sink  212  is in its narrowest width configuration, which allows all twelve DIMM sockets to be populated with DIMM modules. 
         [0025]    Referring to  FIG. 3 , a perspective view of a heat sink  212  is shown. The heat sink  212  is a passive heat exchanger component that cools a device by dissipating heat into the surrounding air. The heat sink  212  includes a base portion  310  as well as a heat dissipation portion  312 . In certain embodiments, the heat dissipation portion comprises heat sink fin array which includes a plurality of heat sink fins such as a stacked fin array. It will be appreciated that other types of fin arrangements are also within the scope of the present invention. 
         [0026]    The heat sink  212  includes a main portion  320  as well as an extendable portion  322 . The main portion  320  comprises a heat sink base as well as a heat sink fin array coupled to the heat sink base. The extendable portion  322  comprises an adjustable heat sink base as well as a heat sink fin array coupled to the adjustable heat sink base. The main portion and the extendable portion are coupled via an adjustment mechanism which is thermally conductive. In certain embodiments, the adjustment mechanism comprises heat pipes  330 . Additionally in certain embodiments, the heat pipes  330  are fixed to one of the main portion and the extendable portion (i.e., the extendable portion as this is the portion that extends) and extend into the other of the main portion and the extendable portion (i.e., the fixed portion as this is the portion from which the other portion extends) via apertures  332  which allow the other of the main portion and the extendable portion to slide along the heat pipes. More specifically, in certain embodiments, in the fixed portion, the heat pipes  330  are fixed (e.g., via solder or some other type of non-sliding thermal interface) into the holes in the fixed portion which include a thermally conductive interface between the sliding heat pipes and the body of the heat sink base. In certain embodiments, the heat pipes of each extension assembly extend towards and inside of precision drilled holes in the base portion of the main portion. A precision thermal/mechanical interface allows for effective heat transfer and structural rigidity. Thermal interface material, such as thermally conductive grease, between the heat pipes and main section base helps to ensure maximum thermal performance. 
         [0027]    Referring to  FIG. 4 , an information handling system motherboard  210  along with another configuration of an adjustable heat sink  212  is shown. More specifically, the heat sink  212  includes the extendable portion  322  as well as another extendable portion  410 . Each extendable portion  322 ,  410  is coupled to the main portion  320  via a plurality of heat pipes  330 . In the configuration shown in  FIG. 4 , each of the extendable portions  322 ,  410  extend over a portion of a single memory socket. More specifically, the adjustable heat sink  212  is extended to occupy the space of one DIMM module pitch closest to the CPU on each side. This configuration allows up to ten DIMM sockets to be populated with DIMM modules. In certain balanced embodiments, this configuration would allow eight DIMM sockets to be populated for a balanced two DIMM per channel configuration). In this embodiment, the extendible portion  322 ,  410  would be affixed to the heat pipes and the heat pipes would extend into and slide within holes in the main portion of the heat sink. In this way, the outside dimension of the heat sink would be defined by how far the extendable portions extend away from the main portion. 
         [0028]    Referring to  FIG. 5 , an information handling system motherboard  210  along with another configuration of the adjustable heat sink  212  is shown. In the configuration shown in  FIG. 5 , each of the extendable portions  322 ,  410  extend over a portion of two memory sockets  214 . In the configuration shown in  FIG. 5 , each of the extendable portions of the adjustable heat sink  212  is extended to occupy the space of two DIMM module pitches closest to the CPU on each side. This configuration allows up to eight DIMM sockets to be populated with DIMM modules. In certain balanced embodiments, this configuration would allow four DIMM sockets to be populated for a balanced one DIMM per channel configuration. 
         [0029]    Referring to  FIG. 6 , a perspective view of the adjustable heat sink  212  is shown. The main portion  320  and the extendable portions  322 ,  410  are coupled via an adjustment mechanism which is thermally conductive. In certain embodiments, adjustment mechanism comprises heat pipes  330 . Additionally in certain embodiments, the heat pipes are fixed to one of the main portion  320  and the extendable portions  322 ,  410  and extend into the other of the main portion and the extendable portion via apertures  332  which allow the other of the main portion and the extendable portion to slide along the heat pipes. In certain embodiments, the extendable portion  322  and the another extendable portion  410  are positioned on opposite sides of the main portion  320 . Additionally, in certain embodiments, the fin array comprises a stacked fin array. 
         [0030]    Referring to  FIG. 7 , a perspective view of another adjustable heat sink  700  is shown. More specifically, the adjustable heat sink  700  includes a main portion  710  as well as a plurality of extendable portions  712  thermally and physically coupled via an adjustment mechanism  720 . The main portion  710  includes a base portion  730  as well as a heat dissipation portion  732 . Each of the extendable portions  712  include respective heat dissipation portions  740  which are fixedly coupled to the adjustment mechanism. To adjust the extendable portions  712 , the heat pipes move within respective apertures of the base portion  730  of the main portion  710 . 
         [0031]    Referring to  FIG. 8 , a perspective view of an adjustable heat sink  800  is shown. More specifically, the adjustable heat sink  800  further includes a removable retention latch  810  that clamps down onto pins  812  that holds a respective extendable portion in a desired position. Referring to  FIG. 9 , a perspective view of an adjustable heat sink  900  is shown. More specifically, the adjustable heat sink  900  further includes a retention latch  910  which includes a plurality of apertures. The retention latch is fixed to the main base portion (e.g., via pin  920 ) and bends to snap onto a pin  922  on the extension section in any of the desired positions. Referring to  FIG. 10 , a perspective view of an adjustable heat sink  1000  is shown. More specifically, the adjustable heat sink  1000  further includes a retention device such as a retention screw  1010  that holds the heat pipe in place to keep the extendable portion in a desired position. 
         [0032]    The present invention is well adapted to attain the advantages mentioned as well as others inherent therein. While the present invention has been depicted, described, and is defined by reference to particular embodiments of the invention, such references do not imply a limitation on the invention, and no such limitation is to be inferred. The invention is capable of considerable modification, alteration, and equivalents in form and function, as will occur to those ordinarily skilled in the pertinent arts. The depicted and described embodiments are examples only, and are not exhaustive of the scope of the invention. 
         [0033]    For example, the information handling system may include an ability for system firmware to detect the current adjustable heat sink position. Also for example, the information handling system may include an ability to determine if the current adjustable Heat sink position is optimal for the populated DIMMs, and if not to alert a user that the heat sink may be extended for optimal performance or to use electro-mechanical means to extended the Heat sink automatically without use intervention. Also for example, the heat sink may be adjusted for optimal acoustic performance (e.g., for acoustic level and tones) vs. populated DIMM Slots. Also for example, the heat sink may be adjusted for optimal air flow, for impedance vs. System Performance, or for power dissipation vs. populated DIMM Slots. Also for example, with other motherboard configurations, the head sink may be adjusted based upon other non-DIMM devices or subsystems.