Lenovo 4X97A59977 SR650 V2 X8/X8 G4 RISER3 CBL KIT CPU1

Lenovo 4X97A59977 SR650 V2 X8/X8 G4 Riser 3 Cable Kit CPU1

Overview

The Lenovo 4X97A59977 is the OEM cable kit that connects the X8/X8 Gen 4 Riser 3 assembly to the CPU1 socket on a ThinkSystem SR650 V2 server. Without this kit, the fourth-generation riser card cannot establish the PCIe signal path to the second processor — meaning multi-GPU or high-density NIC configurations that depend on Riser 3 simply will not function. This is a factory-matched replacement or build-out part, not a generic cable assembly.

Compatibility

Designed exclusively for the Lenovo ThinkSystem SR650 V2 2U rack server platform. It pairs with the X8/X8 Gen 4 Riser 3 card in the CPU1 riser slot position. It is not interchangeable with SR650 (Gen 1) or SR650 V3 riser assemblies — connector keying and lane mapping differ across generations. If you are configuring a rack server with dual processors and need PCIe expansion on the Riser 3 position, confirm your chassis generation is specifically SR650 V2 before ordering. Verify the riser card part number matches the X8/X8 Gen 4 variant; mixed-generation riser and cable combinations are not supported by Lenovo.

Installation Notes

Route the cable between the Riser 3 bracket and the CPU1 riser connector as directed in the SR650 V2 hardware maintenance guide — incorrect seating will result in the slot not being recognized at POST. Ensure both the CPU1 socket is populated and the riser bracket is fully locked before connecting. This part weighs 1.00 lb; handle with standard ESD precautions appropriate for server internal cabling.