Lenovo 4C57A81451 SR250 V2 X8/X8 PCIE GEN4 Riser

Lenovo 4C57A81451 SR250 V2 PCIe Gen4 x8/x8 Riser Card

Overview

The 4C57A81451 is a PCIe Gen4 x8/x8 riser card designed for the Lenovo ThinkSystem SR250 V2 rack server. It provides two x8 PCIe Gen4 slots, letting you install additional expansion cards — such as network adapters, HBAs, or storage controllers — without consuming the server's native onboard slots. At 0.35 lb and 9.60 x 6.00 x 2.20 in, it fits within the SR250 V2 chassis envelope without modification.

Compatibility

This riser is designed specifically for the Lenovo ThinkSystem SR250 V2 (1U rack server). It is not a universal riser — do not attempt to fit it in earlier SR250 (V1) systems or other ThinkSystem chassis; the physical connector, bracket geometry, and PCIe generation are SR250 V2-specific. Before ordering, confirm your server's chassis model against Lenovo's SR250 V2 server components compatibility matrix. The UNSPSC code 43211600 classifies this as a computer storage device component, consistent with its role in a rack server expansion architecture.

Installation Notes

Install with the SR250 V2 powered down and unplugged. The riser slots into the designated riser cage position in the chassis — no tools are required beyond standard server servicing practice (ESD precautions apply). Ensure any PCIe cards installed into the riser do not exceed the slot's x8 electrical bandwidth or the chassis thermal envelope for the SR250 V2. Refer to the SR250 V2 server accessory installation guide for torque specs on the riser retention screw and card bracket fasteners.