Intel Xeon Processor Multiprocessor Platform Design Guide

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Processor Power Distribution Guidelines
8.6 Processor Load
8.6.1 Processor Voltage Tolerance
Refer to the processor datasheet for die voltage tolerance specifications. Failure to meet these
specifications on the low-end tolerance can result in system error or lock up. Not meeting these
specifications on the high-end tolerance can cause damage or reduce the life of the processor.
Refer to the VRM 9.1 DC-DC Converter Design Guidelines for voltage regulator tolerance
specifications (regulation requirements at the voltage regulator remote sense point located at the
geometric center of the processors).
Figure 8-1. Power Distribution Block Diagram for 4- Way System Motherboard with Voltage
Regulator Modules
Output Enable Logic
VIDx[4:0]
OUTEN
Processor 1
Processor 2
Processor 3
Processor 4
Power
Supply
Voltage Regulator
Module 1
Voltage Regulator
Module 2
Voltage Regulator
Module 3
Voltage Regulator
Module 4
PWR OK
VIDx[4:0]
THERMTRIP#