Lenovo 4C57A81450 SR250 V2 X16 PCIE GEN4 Riser

Lenovo 4C57A81450 PCIe Gen4 x16 Riser Card

Overview

The Lenovo 4C57A81450 is a PCIe Gen4 x16 riser card designed to expand the I/O capacity of compatible ThinkSystem server platforms. If you need to add a full-length, full-height x16 expansion card — a GPU, HBA, NIC, or capture card — where the base server configuration provides no direct slot access, this riser is the mechanical and electrical bridge that makes it possible. At 0.25 lb and 9.60 x 5.90 x 2.20 in, it installs inside the server chassis without external modification.

Compatibility

This riser is designed for the Lenovo ThinkSystem SR250 V2 server platform. It is not a universal riser — do not attempt to fit it in other SR-series chassis (SR630, SR650, SR250 V1) without confirming mechanical and backplane compatibility via Lenovo's ServerProven tool. Verify your SR250 V2 configuration guide to confirm which riser slot position (typically Slot 1 or Slot 2) accepts the x16 Gen4 riser before ordering. Pairing with compatible network adapters or storage HBAs is the most common deployment use case for this slot.

Installation Notes

Installation is tool-assisted inside the SR250 V2 chassis — the riser seats into a dedicated backplane connector and is secured by the chassis retention mechanism. PCIe Gen4 signaling requires that the installed expansion card also support Gen4 or is backward-compatible with Gen3; the slot negotiates the highest mutually supported link speed automatically. Ensure the server's power budget accounts for the TDP of any card installed in this riser — the SR250 V2's power subsystem and the riser itself impose no additional wattage overhead, but the card you install does. Consult Lenovo's server configuration resources or a pre-sales engineering contact for GPU or dual-port NIC power validation before provisioning.