Lenovo 4XF7A72373 SR655 X16/X16 PCIE Riser 3 KIT V2

Lenovo 4XF7A72373 SR655 PCIe X16/X16 Riser 3 Kit V2

Overview

The Lenovo 4XF7A72373 is a dual-slot PCIe riser kit designed to extend the expansion capability of ThinkSystem SR655 servers. Designated as Riser 3 in the SR655 slot architecture, this V2 kit provides two full-width x16 PCIe lanes — giving architects room to install high-bandwidth adapters such as dual-port 100GbE NICs, compute accelerators, or storage HBAs in positions that the base server configuration does not expose. Without a riser kit like the 4XF7A72373, those PCIe slots simply aren't accessible; the kit bridges the riser card and chassis midplane so the slots register correctly to the host BIOS and operating system.

Compatibility

This kit is specific to the Lenovo ThinkSystem SR655 1U/2U AMD EPYC server platform. The V2 designation indicates it is paired with the second-generation SR655 chassis revision — confirm your SR655 chassis revision against Lenovo's configurator before ordering, as V1 and V2 risers are not interchangeable. This riser occupies the Riser 3 position in the SR655 server expansion hierarchy; installing it in Riser 1 or Riser 2 positions is not supported. It is not compatible with SR645, SR665, or other ThinkSystem platforms. If you are specifying adapters for this riser, verify that each card's physical x16 form factor and power envelope fall within the SR655 chassis thermal and power limits documented in the server's Hardware Maintenance Manual.

Installation Notes

Installation requires powering down the SR655 and removing the top cover per standard Lenovo service procedures. The riser kit mounts to the chassis riser cage bracket — no separate tools beyond a standard Phillips screwdriver are required for the mechanical attachment, though a torque spec is not published in the available evidence. Ensure PCIe adapter cards seated in this riser are fully latched before closing the chassis; partial seating in x16 slots can cause POST errors or adapter non-detection that are difficult to diagnose at the OS level.