Lenovo 4XH7A61083 SR665 X16/X16 PCIE G4 Riser 3 KIT V2

Lenovo 4XH7A61083 SR665 PCIe Gen4 x16/x16 Riser 3 Kit V2

Overview

The Lenovo 4XH7A61083 is a PCIe Gen 4 x16/x16 Riser 3 Kit V2 designed for the ThinkSystem SR665 server platform. It provides two full-bandwidth x16 PCIe Gen 4 slots via a third riser position — the configuration to reach for when the base riser complement is already occupied and you need additional high-throughput expansion capacity for GPUs, NVMe HBAs, high-speed NICs, or capture cards in dense compute or storage deployments. PCIe Gen 4 doubles the per-lane bandwidth of Gen 3, so each x16 slot delivers up to 64 GB/s — relevant when pairing with Gen 4-capable accelerators or storage controllers where lane saturation would otherwise throttle throughput.

Compatibility

The 4XH7A61083 is engineered specifically for the Lenovo ThinkSystem SR665 server. It occupies the Riser 3 slot position on the SR665 motherboard — verify your SR665 chassis and system board revision support a third riser before ordering, as not all SR665 configurations ship with Riser 3 mechanical provisions. This kit is not cross-compatible with the SR650, SR630, or other ThinkSystem rack server platforms; riser cards are mechanically and electrically platform-specific. Confirm your SR665 is running a compatible firmware level per Lenovo's SR665 configuration guide before installing Gen 4 expansion cards, as PCIe link negotiation behavior can vary by BIOS revision.

Installation Notes

At 10 lb, the 4XH7A61083 is heavier than a typical riser bracket — account for this when planning rail and cable management in a rack enclosure. Seat the riser firmly into the system board connector and ensure any PCIe cards installed into the riser are secured with the appropriate retention hardware before powering the system. Follow Lenovo's SR665 field replacement documentation for torque and ESD handling procedures; improper seating on a Gen 4 connector can cause link training failures that present as undetected devices rather than obvious errors.