AMD 30925 manual Processor Heatsink Grounding

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30925 Rev. 3.04 February 2004

Builder’s Guide for AMD Opteron™ Processor-

 

Based Servers and Workstations

8. Processor Heatsink Grounding

 

Although grounding of the processor heatsink has not yet been required on any AMD Opteron processor-based systems, grounding of the processor heat sink can further lower the harmonic EMI levels of the processor. Many AMD Opteron processor-based motherboards contain grounding pads around the footprint area of the processor. These grounding pads can be used to ground the heatsink to the motherboard.

If excessive system level EMI radiated emissions exist after attempting all the listed EMI reduction techniques, then more extensive remedies may be necessary. First, determine if the emissions emanate from the system I/O cables (including the AC power cord) or from aperture leaks in the system chassis. If EMI emissions emanate from a particular I/O cable, then improved filtering or cable shielding may be required on that cable. If EMI emissions emanate from slots or seams in the chassis enclosure, use copper tape across the apertures to improve shielding effectiveness. If copper tape reduces emission levels to a satisfactory level, then chassis sheet metal changes or conductive EMI gasketing can be added at that location.

Chapter 6

EMI Reduction Techniques

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Contents Revision Trademarks Contents EMI Reduction Techniques Servers and WorkstationsAMD Opteron Processor Architecture List of FiguresList of Tables Date Revision Description Revision HistoryRevision History AMD64 Architecture AMD Opteron Processor Key Architectural FeaturesOther 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 AMD64 Processor-in-a-Box AMD Opteron Processor-In-a-BoxServers and Workstations AMD Opteron Processor-In-a-Box Heatsink Installation Procedure Heatsink InstallationBackplate 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 System Enclosures and Chassis Selection Hardware ConsiderationsBasic System Enclosure Selection Guidelines Basic Chassis Selection GuidelinesDesirable Airflow-Power Supply with Bottom Inlet Power Supply ConsiderationsServer and Workstation Platform Power Supplies Power Supply GuidelinesPower Worksheet 1-Component Power Calculating System Power ConsumptionTotal Watts A = W For Each Voltage Level Power Worksheet 2-Total WattsAMD Opteron Processor Thermal Solution Guidelines Thermal SolutionAMD Opteron Processor Information Memory Guidelines for AMD Opteron Processor- Based SystemsAMD64 AMD Opteron Processor Series and Model NumbersAMD-8000 Series Chipset AMD Chipset InformationAMD-8131 HyperTransport PCI-XTunnel Graphics and StorageAMD-8000 Series Chipset Drivers AMD Opteron Processor Utilities and UpdatesBit Operating Systems Drivers for Linux Kernel Linux Drivers for the AMD-8000 Series of Chipset ComponentsServers and Workstations Hardware Considerations EMI Reduction Techniques EMI Emission StandardsSpread Spectrum Clocking Power Supply Cable Routing Disable Unused ClocksRear I/O Connector Shield 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 AMD Opteron Processor FAQs Appendix B FAQsWhat is the value proposition of the AMD Opteron processor? Where are EMI guidelines for motherboards located? Validated Server Program FAQsWill these validated servers be available in all regions? Builder’s Guide for AMD Opteron Processor