Lenovo 4XC7A86669 NDR QSFP200 2P GEN5 IB Adapter DWC SIO

Lenovo 4XC7A86669 NDR QSFP200 2-Port Gen5 InfiniBand Adapter DWC SIO

Overview

The Lenovo 4XC7A86669 is a dual-port NDR QSFP200 Gen5 InfiniBand adapter designed as a System I/O (SIO) card for Lenovo Neptune Direct Water Cooled (DWC) server platforms. With a QSFP interface and NDR (Next Data Rate) InfiniBand signaling, this card targets high-performance computing and AI/ML cluster interconnects where fabric bandwidth and latency are the primary bottlenecks — not standard Ethernet switching. The 4XC7A86669 is a factory-new, genuine Lenovo option part sourced through the standard distribution channel, classified under UNSPSC 43201404 (network interface cards).

Compatibility

This adapter is engineered for Lenovo ThinkSystem DWC (Direct Water Cooled) server nodes that accept SIO (System I/O) mezzanine-style expansion cards. Specific compatible platforms include the Lenovo ThinkSystem SD650 V2 and SD650-N V2 DWC tray nodes housed in the Neptune DWC Solution enclosures (such as the ThinkSystem D2 and SE360 V2 chassis in DWC configurations). The QSFP200 port format requires NDR-capable InfiniBand switches and cables — standard QSFP28 (100GbE/HDR100) infrastructure is not pin- or protocol-compatible with NDR. Verify your fabric switch and cable plant support NDR (200Gb/s per port) before ordering.

Installation Notes

Installation is performed at the node level inside the DWC enclosure — the SIO card slots into the designated mezzanine connector on the server tray. DWC enclosures require proper water-loop connections before powering on; do not operate the node dry. The adapter weighs 10.00 lb including packaging (country of origin: MX). Confirm the target node's UEFI firmware supports NDR fabric before deployment, as Gen5 InfiniBand may require a firmware update on older ThinkSystem SD650 V2 nodes.