Lenovo 4XC7A86672 HDR QSFP56 1P GEN4 IB Adapter DWC SIO

Lenovo 4XC7A86672 HDR QSFP56 1-Port Gen4 InfiniBand Adapter

Overview

The Lenovo 4XC7A86672 is a single-port HDR QSFP56 Gen4 InfiniBand adapter designed for Direct Water Cooling (DWC) and Single I/O (SIO) server configurations. It delivers high-bandwidth, low-latency fabric connectivity for HPC clusters, AI training workloads, and high-density data center deployments where thermal constraints require liquid-cooled infrastructure. The QSFP56 interface supports HDR InfiniBand speeds, giving dense compute nodes the interconnect throughput needed to avoid becoming network-bottlenecked during parallel processing runs.

Compatibility

This adapter is engineered for Lenovo ThinkSystem server platforms that support the DWC SIO slot architecture — primarily high-density liquid-cooled nodes within the Neptune DWC line. Verify your specific ThinkSystem node model and SIO slot availability against Lenovo's official compatibility matrix before ordering; not all ThinkSystem chassis support SIO form-factor cards. The QSFP56 interface requires a compatible HDR InfiniBand switch — such as those in the data center fabric switches category — and HDR-rated QSFP56 cables or transceivers. Mixing HDR adapters with EDR or FDR switch infrastructure will result in link negotiation at the lower speed.

Installation Notes

The 4XC7A86672 is classified under UNSPSC 43201404 (network interface cards) and ships from Mexico (country of origin: MX). At 10 lb, the weight reflects adapter plus any integrated liquid-cooling hardware required for DWC deployments — confirm rack weight budgets before populating dense chassis fully. Installation into DWC nodes requires the liquid-cooling loop to be properly depressurized and sealed before card seating; follow Lenovo's DWC service procedures for your specific chassis to avoid coolant path damage. No field-replaceable thermal paste or torque specs are published in available evidence.