AMD 30925 manual Power Supply Considerations, Desirable Airflow-Power Supply with Bottom Inlet

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Builder’s Guide for AMD Opteron™ Processor-Based

30925 Rev. 3.04 February 2004

Servers and Workstations

 

Cables inside the enclosure can cause airflow disruptions. Using cable ties, tie and route the cables out of the path of the cooling airflow.

For tower chassis, choose a chassis with power supplies that have both ATX-style bottom air intake vents and front air intake vents.

When the system is in a tower chassis, there must be clear space in front of the chassis to allow cool airflow in and space behind the chassis for the heated air to flow out.

Rear fans should exhaust air in the same direction—out the back of the chassis.

Front intake fans may not be of significant benefit to cooling a tower chassis, and should not be relied upon as the sole fan in a system.

Testing done by the AMD thermal engineers has shown that the airflow pattern in Figure 21 is more desirable than the airflow pattern seen in Figure 22 on page 31.

When the bottom inlet power supply is used, nearly all the air flows near or through the area of the processor. As a result, the processor remains cooler.

5.1.3Power Supply Considerations

Because heatsinks are heat radiators, like the radiator in an automobile, they need airflow to function properly. Figure 21 shows desirable airflow through a chassis. Both desirable configurations use a bottom-inlet power supply.

Figure 21. Desirable Airflow—Power Supply with Bottom Inlet

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Hardware Considerations

Chapter 5

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Contents Revision Trademarks Contents Servers and Workstations EMI Reduction TechniquesList of Figures AMD Opteron Processor ArchitectureList of Tables Revision History Date Revision DescriptionRevision History AMD Opteron Processor Key Architectural Features AMD64 ArchitectureOther Features of the AMD Opteron Processor Integrated DDR Dram Memory ControllerHyperTransport Technology Validated Server Program VSP Value PropositionDesign Methodology for the VSP Platform Platform Description Model A2210 1U/2P Rack Server Model A8440 4U/4P Rack Server Not Yet a Member of VSP? Servers and Workstations Validated Server Program VSP AMD Opteron Processor-In-a-Box AMD64 Processor-in-a-BoxServers and Workstations AMD Opteron Processor-In-a-Box Heatsink Installation Heatsink Installation ProcedureBackplate Release Liner Ensure Proper Contact Between Backplate and Motherboard Tightening Down the Retention Frame Pushing Gently Down on the Processor Heatsink Centered Over Processor Pushing Straight Down on the Clip Turning the Cam Lever Installed Heatsink Servers and Workstations Heatsink Installation Basic System Enclosure Selection Guidelines Hardware ConsiderationsSystem Enclosures and Chassis Selection Basic Chassis Selection GuidelinesPower Supply Considerations Desirable Airflow-Power Supply with Bottom InletPower Supply Guidelines Server and Workstation Platform Power SuppliesCalculating System Power Consumption Power Worksheet 1-Component PowerPower Worksheet 2-Total Watts Total Watts A = W For Each Voltage LevelThermal Solution AMD Opteron Processor Thermal Solution GuidelinesMemory Guidelines for AMD Opteron Processor- Based Systems AMD Opteron Processor InformationAMD Opteron Processor Series and Model Numbers AMD64AMD Chipset Information AMD-8000 Series ChipsetGraphics and Storage AMD-8131 HyperTransport PCI-XTunnelAMD Opteron Processor Utilities and Updates AMD-8000 Series Chipset DriversBit Operating Systems Linux Drivers for the AMD-8000 Series of Chipset Components Drivers for Linux KernelServers and Workstations Hardware Considerations EMI Reduction Techniques EMI Emission StandardsSpread Spectrum Clocking Rear I/O Connector Shield Disable Unused ClocksPower Supply Cable Routing Processor Heatsink Fan Cable RoutingProcessor Heatsink Grounding Servers and Workstations EMI Reduction Techniques Appendix a AMD Opteron Processor-Based System Build Procedure Builder’s Guide for AMD Opteron Processor Builder’s Guide for AMD Opteron Processor-Based Appendix B FAQs AMD Opteron Processor FAQsWhat is the value proposition of the AMD Opteron processor? Validated Server Program FAQs Where are EMI guidelines for motherboards located?Will these validated servers be available in all regions? Builder’s Guide for AMD Opteron Processor