Lenovo 4XH7A09841 SR655 X8/X8 PCIE RISER3 FH KIT

Lenovo 4XH7A09841 SR655 PCIe x8/x8 Riser 3 Full-Height Kit

Overview

The Lenovo 4XH7A09841 is a PCIe riser kit designed to expand the card capacity of the ThinkSystem SR655 server. It provides an x8/x8 PCIe configuration in a full-height (FH) form factor, enabling you to install two additional full-height PCIe cards in the third riser slot — the practical answer when your SR655 workload grows to need additional GPU, NIC, HBA, or capture card slots beyond what the base configuration provides. At 2 lb and 5.00 x 4.00 x 5.00 in, it is a compact but structurally complete bracket-and-riser assembly intended for tool-assisted installation inside the SR655 chassis.

Compatibility

The 4XH7A09841 is designed specifically for the Lenovo ThinkSystem SR655 rack server. It occupies the Riser 3 position and is not interchangeable with riser kits designed for other ThinkSystem models (SR650, SR630, SR665, etc.) — riser slot geometry, backplane connector pinout, and bracket height are chassis-specific. Verify your SR655 configuration supports a third riser before ordering; some SR655 base configs ship without the Riser 3 mechanical provisions populated. This kit is classified under UNSPSC 43211600 (computer server components), consistent with server expansion hardware.

Installation Notes

Installation requires powering down and fully removing the SR655 from the rack to access the riser bay. The x8/x8 electrical configuration means each slot delivers up to PCIe x8 bandwidth — sufficient for dual 10/25GbE NICs, HBAs, or mid-range compute accelerators, but not a substitute for a native x16 slot if you need full-bandwidth GPU throughput. Confirm the cards you plan to install do not exceed the SR655 chassis power budget for Riser 3 before commissioning. Consult the Lenovo SR655 Installation and Service Guide for torque specs and the correct riser seating sequence.