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.
Product Key Features
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1 × QSFP56 port supporting HDR100 InfiniBand or 100 Gb Ether
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PCIe 4.0 ×16 interface (compatible with PCIe 1/2/3)
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Mellanox ConnectX‑6 chipset with VPI support
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Advanced protocol support: RDMA, MPI, iSCSI, TCP/IP, UDP/IP
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Offloads: RSS, MSI‑X, LSO/LRO, jumbo frames, PXE, congestion control
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Low-profile form factor; ~15.6 W typical power
Reliability & Performance
Engineered for latency-sensitive HPC and enterprise storage deployments, this adapter delivers consistent line-rate performance with sub‑microsecond latency, especially when paired with HPE HDR switches and cabling Its ConnectX‑6 architecture includes deep virtualization and transport offloads, which optimize throughput without taxing the server CPU—critical for high-density virtual or analytic workloads. With multi-protocol operation (InfiniBand and Ethernet) on a single interface, the adapter simplifies infrastructure and maximizes flexibility. It supports advanced error handling, congestion management, and traffic prioritization features like QoS, MPLS, and large packet offload. The card’s compatibility across several PCIe generations enables deployment in both latest and legacy servers.
Key Features :
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100 Gb HDR InfiniBand or 100 Gb Ethernet via QSFP56
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PCIe 4.0 ×16 (retro‑compatible with older PCIe)
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RDMA, MPI, iSCSI, VLAN, jumbo frames, RSS, LSO/LRO, PXE
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Mellanox ConnectX‑6 VPI architecture
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Low power usage (~15.6 W)
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Low-profile plug-in form factor
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