HPE P23665-B21

InfiniBand HDR100/100 Gb QSFP56 Gigabit Ethernet Adapter (MCX653105A‑ECAT)

The HPE P23665‑B21 is a versatile, high-performance network adapter offering a single QSFP56 port capable of operating as either a 100 Gbps InfiniBand HDR100 or 100 Gbps Ethernet link. Built on Mellanox ConnectX‑6 technology, this low-profile PCIe 4.0 ×16 adapter delivers ultra-low latency and up to 100 Gbps throughput—ideal for HPC clusters, storage fabrics, and high-speed data center deployments. With hardware offload capabilities for RDMA (RoCE), MPI, congestion control, and virtualization, it slashes CPU utilization and accelerates network-intensive workflows. Designed to integrate seamlessly into HPE ProLiant Gen10/Gen10+ and Gen11 servers, it supports both server and storage convergence scenarios while simplifying cable infrastructure.

Features

This adapter connects via the PCI Express 4.0 ×16 interface (backward-compatible with PCIe 1/2/3), offering full-bus throughput and efficient power usage (~15.6 W typical) in a compact low-profile stand-up card . Equipped with a QSFP56 connector, it supports high-speed copper or active optical cables (DAC/AOC) for data transfer links up to 100 Gb/s The adapter supports both Ethernet and InfiniBand traffic over a single port, enabling hybrid VPI (Virtual Protocol Interconnect) mode. InfiniBand features include HDR100 link speeds, adaptive routing, MPI offloads (e.g. tag-match, rendezvous), FDR/QDR support, and advanced transport protocols (XRC, DCT, UMR, ODP) for HPC workloads . Ethernet capabilities include standard protocols such as TCP/IP, UDP/IP, iSCSI, jumbo frames, VLANs, RSS, MSI-X, LSO/LRO, PXE boot, and RoCE for RDMA acceleration on storage or virtualization traffic

Advanced Options

Supported in a wide range of HPE platforms—including ProLiant DL360/DL380/DL385 Gen10, Gen11, and Apollo XL systems—this adapter is ideal for HPC and converged cloud environments Enterprise-grade firmware ensures reliable, high-performance connectivity across protocols.Certified for HPE Gen10/Gen11 ProLiant and Apollo systems, it offers firmware and driver continuity via HPE support channels. Its modest power draw makes it suitable for thermally constrained environments. Overall, the P23665‑B21 provides ultra-fast, reliable, and converged networking performance for modern data center and HPC use cases.