Specifications

Table Of Contents

Voltage Regulator Modules (VRMs)

Up to six voltage regulator modules provide power for processors. Every processor

requires1.5VRMs,sowith four processors,youmust use six VRMs.Table 2-1shows this

relationship.

You must use a speciﬁc number and connector population sequence of VRMs for each

combination of processors and termination boards. Table 2-2 lists the required number

and location of VRMs for each potential processor. Figure 2-9 shows this information

graphically.

Table 2-1 VRM and Processor Power Sequence

VRM # VRM provides power for Description

1 Processor #1 Processor core power only

2 Processor #1 and #2 L2 cache power only

3 Processor #2 Processor core power only

4 Processor #3 Processor core power only

5 Processor #3 and #4 L2 cache power only

6 Processor #4 Processor core power only

Table 2-2 Processor and VRM Population Sequencing

If you have a processor in connector # You must have a VRM in connector #

1 1 and 2

1 and 2 1, 2, and 3

1, 2, and 3 1, 2, 3, 4 and 5

1, 2, 3, and 4 1, 2, 3, 4, 5, and 6