Lenovo 4XH7A86136 SR635 V3/SR645 V3 X16 PCIE G5 Riser 1 LP

Lenovo 4XH7A86136 SR635 V3 / SR645 V3 PCIe Gen5 x16 Riser 1 Low-Profile

Overview

The Lenovo 4XH7A86136 is a PCIe Gen 5 x16 Riser 1 low-profile card designed to expand the I/O capacity of Lenovo ThinkSystem SR635 V3 and SR645 V3 rack servers. If you're adding a network adapter, storage HBA, or other PCIe expansion card to one of these platforms, this riser is the mechanical and electrical interface that makes it possible. Without the correct riser installed, the server chassis has no physical slot to accept a half-height add-in card — this part fills that gap directly.

Compatibility

The 4XH7A86136 is designed specifically for the Lenovo ThinkSystem server platforms listed below. Installing it in any other chassis is not supported and may result in mechanical or electrical incompatibility:

• Lenovo ThinkSystem SR635 V3 — AMD EPYC-based 1U rack server
• Lenovo ThinkSystem SR645 V3 — AMD EPYC-based 2U rack server

The riser supports the PCIe Gen 5 x16 interface, which matches the host bus architecture on both V3-generation platforms. Verify your server's current riser configuration before ordering — some server configurations ship with risers pre-installed, and adding a second riser requires an open riser bay. Consult the SR635 V3 or SR645 V3 maintenance manual to confirm bay availability and which riser position this part occupies (Riser 1).

Installation Notes

This is a low-profile riser, meaning it accommodates half-height add-in cards only — full-height cards will not fit. Confirm that any PCIe add-in card you intend to install carries a low-profile bracket or includes one in the box. The riser slots into a dedicated connector on the server's system board; no tools beyond a standard server screwdriver are typically required, but follow the ESD precautions and torque specifications in the Lenovo SR635 V3 / SR645 V3 Hardware Maintenance Guide before seating the card. Weight is 10.00 lb as shipped — handle accordingly when staging in a rack environment.