ATX Version 3.0 Multi Rail Desktop Platform Power Supply

Design Guide

ID 336521
Date 02/01/2023

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Document Table of Contents

PCIe* Add-in Card Auxiliary Power Connectors Sideband Signals

The new 12VHPWR connector has 4 sideband signals defined that communicate between the Power Supply and the PCIe* Card. Two of these sideband signals are required with the connector and two of them are optional from the Power Supply. The four sideband signals are:

  • SENSE0
  • SENSE1

For the most up to date and detailed description, refer to Section Section 5.3 – Optional Sideband Signal in the PCI Express* Card Electromechanical Specification, Revision 5.0. That document is available from