ATX Version 3.0 Multi Rail Desktop Platform Power Supply

Design Guide

ID 336521
Date 01/02/2022
Version 2.0
Public
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
  • CARD_​PWR_​STABLE
  • CARD_​CBL_​PRES#

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 www.pcisig.com.