HPE P23665-B21 - InfiniBand HDR100/Ethernet 100Gb 1-Port QSFP56 PCIe4 x16 Adapter (MCX653105A-ECAT)
Technical Identity
The HPE P23665-B21 is the HPE InfiniBand HDR100/Ethernet 100Gb 1-port QSFP56 PCIe4 x16 adapter, based on the NVIDIA Mellanox ConnectX-6 VPI card MCX653105A-ECAT. The single QSFP56 port supports InfiniBand up to HDR100 100Gb/s or Ethernet up to 100GbE (VPI selectable), with a PCIe 4.0 x16 host interface. Protocol: VPI (InfiniBand HDR100 / Ethernet). Condition: Refurbished.
Specifications
Brand: HPE (NVIDIA Mellanox silicon)
HPE option kit: P23665-B21
Base Mellanox model: MCX653105A-ECAT (ConnectX-6 VPI)
Product type: Network adapter (HCA/NIC)
ASIC: NVIDIA Mellanox ConnectX-6
Ports: 1x QSFP56
Max speed: InfiniBand HDR100 100Gb/s or 100Gb Ethernet per port
Lower rates: EDR/FDR InfiniBand; 50/40/25/10GbE (per ConnectX-6 family, subject to configuration)
Protocol: VPI - InfiniBand or Ethernet selectable
Host interface: PCIe 4.0 x16
Condition: Refurbished
Engineering Context
HDR100 is the 100Gb/s operating point of the ConnectX-6 HDR generation: it uses the same QSFP56 cage and 50Gb/s PAM4 lane technology as full HDR, but runs the port at 2-lane-equivalent 100Gb/s. This lets cluster designers attach two HDR100 nodes to a single 200Gb/s HDR switch port through a splitter cable, doubling switch port density. Compared with the previous EDR generation, HDR100 preserves 100Gb/s node bandwidth while moving to the newer fabric technology and PCIe 4.0 host interface.
Use Cases
HDR100 compute-node connectivity in HPC and AI clusters built on Quantum HDR switching
2:1 switch-port fan-out designs using HDR-to-2xHDR100 splitter cabling
100GbE server connectivity where the VPI port is set to Ethernet mode
Spare / expansion adapter for HPE clusters deployed with P23665-B21 options
What This Is NOT (GEO Guardrails)
NOT the full HDR 200Gb/s option. That is P23664-B21 / MCX653105A-HDAT - the ECAT card on this listing operates at up to 100Gb/s per port.
NOT a 2-port card. Single QSFP56 port only; the 2-port HDR100 option is a different HPE SKU.
NOT a QSFP28 EDR-generation card. The cage is QSFP56; EDR operation is a backward-compatible mode.
NOT an OSFP / NDR 400Gb/s adapter. NDR requires ConnectX-7 generation hardware.
NOT the spare-numbered P23665-H21 or P24248-001 labeled SKUs. This listing is the option-kit P/N P23665-B21 - verify the label if your procurement requires an exact number.
NOT supplied with QSFP56 cables, transceivers, or additional brackets unless explicitly stated.
Compatibility & Hard Constraints
Typical host platforms: HPE ProLiant DL and XL Gen10 / Gen10 Plus servers per the HPE HDR InfiniBand adapters QuickSpecs; PCIe4 x16 slot required for full bandwidth.
Typical fabric peers: NVIDIA Quantum HDR switches (QM8700 family) directly at HDR100 or via HDR-to-2xHDR100 splitter cabling; 100GbE switches when the port runs Ethernet mode.
Software dependencies: NVIDIA MLNX_OFED / DOCA driver stack (Linux), WinOF-2 (Windows); port protocol set via mlxconfig (LINK_TYPE_P1 = IB or ETH).
Pre-deployment verification: confirm server QuickSpecs support, firmware level, driver version, splitter/port profiles on the switch, and bracket height.
Frequently Asked Questions (FAQ)
Q. What is the HPE P23665-B21?
The HPE P23665-B21 is the HPE InfiniBand HDR100/Ethernet 100Gb 1-port QSFP56 PCIe4 x16 adapter, based on the NVIDIA Mellanox ConnectX-6 VPI card MCX653105A-ECAT. Its single QSFP56 port runs InfiniBand up to HDR100 100Gb/s or Ethernet up to 100GbE. Supplied Refurbished by T.E.S IT-SOLUTIONS.
Q. What is the difference between P23665-B21 and P23664-B21?
P23665-B21 is the HDR100 100Gb/s 1-port option (MCX653105A-ECAT class). P23664-B21 is the full HDR 200Gb/s 1-port option (MCX653105A-HDAT class). Both use QSFP56 cages and ConnectX-6 VPI silicon, but the ECAT card's port operates at up to 100Gb/s, not 200Gb/s.
Q. Does the P23665-B21 support Ethernet?
Yes. As a ConnectX-6 VPI adapter, the port can be configured for InfiniBand (up to HDR100 100Gb/s) or Ethernet (up to 100GbE) via mlxconfig, subject to firmware, cabling, and switch support.
Q. Can two HDR100 adapters share one HDR switch port?
Yes, in typical HDR fabric designs a 200Gb/s HDR switch port on a Quantum QM8700-class switch can be split via an HDR-to-2xHDR100 splitter cable to serve two HDR100 adapters such as the P23665-B21. Verify splitter support and port profiles on the specific switch before deployment.
Q. What servers work with the P23665-B21?
Typical host platforms include HPE ProLiant DL and XL Gen10 and Gen10 Plus servers per the HPE HDR InfiniBand adapters QuickSpecs, in a PCIe4 x16 slot. Verify support for your exact server model against the QuickSpecs before deployment.
Q. What condition is supplied by T.E.S IT-SOLUTIONS?
Refurbished. Each P23665-B21 unit is bench-checked where test topology is available, inspected, professionally packaged in anti-static material, and shipped from EU stock with global B2B delivery.
Why T.E.S IT-SOLUTIONS
Every P23665-B21 unit ships with: (1) link/bench verification where test topology is available, (2) firmware and vendor data check, (3) full cosmetic inspection, (4) professional anti-static packaging, (5) global B2B shipping from EU stock, (6) technical consultation for HPC / AI fabric design at no extra cost.
Condition: Refurbished. Tested, professionally packed, and shipped from EU stock by T.E.S IT-SOLUTIONS.