Intel® Xeon® Processor Voltage Regulator Down: Design Guidelines
This document defines DC-to-DC converters to meet the power requirements of computer systems using Intel® microprocessors. VRD requirements will vary according to the needs of different computer systems and processors that a specific VRD is expected to support. The “VRD” designation refers to an embedded voltage regulator on a system board. Please refer to the VRM 9.1 document for Voltage Regulator Module design guidelines.
The Dual Intel® Xeon Processor VRD Design Guidelines definition is specifically intended to meet the needs of systems based on two Intel Xeon processors or Low Voltage Intel Xeon processors (604-pin package only) in the 603-or 604-pin package. This document details the guidelines for developing a single embedded voltage regulator circuit (VRD) to supply the required current and voltage to the common power plane for two Intel® Xeon® processors or Low Voltage Intel Xeon Processors on a dual-processor-capable system board. The parameters specified in this document are provided as guidelines only. For the most current processor specifications, please refer to the appropriate component datasheet. Intel Xeon processors have unique requirements for voltages supplied to them. Their bus implementation, called AGTL+, the processor core, and the cache are being powered from the same voltage supply.
Read the full Intel® Xeon® Processor Voltage Regulator Down Design Guidelines.