What is the overhang on pci express connectors for? Is it for a rarely used board latching feature? I am referring to the feature being pointed to in this picture.

PCI Express connector with arrow


1 Answer 1


Exactly, this feature is for optional fastening of PCIe cards and it's known as retention ridge.

Quoting from the PCI Express® Card Electromechanical Specification (Rev. 2.0):

an optional ridge feature is defined on the top of the connector housing on one side.
This feature can be used to facilitate card retention. A retention clip may be mounted on an add-in card and latched on the ridge.


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