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66 SKA4 Baseboard Product Guide
Installing Processor Heatsinks
See Figure 5.
Depending on your configuration, the heatsink for each processor might not be attached. In this
case, you must attach one heatsink to each processor. If you are working with a processor
terminator module, you do not install a heatsink.
1. Remove the heatsink from its protective cover.
2. Pull the tab on the bottom of the heatsink to remove the blue plastic film and expose the square
of adhesive thermal grease that will help attach the heatsink to the processor.
3. Orient the heatsink on the correct side of the processor. For correct orientation, see Figure 5.
4. Because of the adhesive grease on the heatsink, be careful to orient the heatsink properly
before placing it against the processor.
5. Attach the heatsink to the processor with five 6-32 X 3/8 screws, and tighten to 8-10 inch-
pounds.
Voltage Regulator Modules (VRMs)
Up to seven voltage regulator modules provide power for processors. Table 44 shows this
relationship.
Table 44. VRM/Processor Power Sequence
VRM # VRM provides power for Description
1 (Embedded) Processor #1 Processor core power only
2 (Embedded) Processor #1 GLT (FSB reference)
3 (Embedded) Processor #1 and #2 L2 cache power only
4 (Embedded) Processor #3 and #4 L2 cache power only
#2 Connector Processor #2 Processor core power only
#3 Connector Processor #3 Processor core power only
#4 Connector Processor #4 Processor core power only
VRMs 1 through 4 are embedded in the SKA4 baseboard. Additional VRMs plug into connectors
2 though 4 on the baseboard. You must use a specific number and connector population sequence
of VRMs for each combination of processors and termination boards. Table 45 lists the required
number and location of VRMs for each potential processor. Figure 1 on page 14 shows this
information graphically.
Table 45. Processor/VRM Population Sequencing
If you have a processor in connector # VRM in connector #
1 None. All required VRMs are embedded in the
SKA4 baseboard.
1 and 2 2
1, 2, and 3 3
1, 2, 3, and 4 4