HPE P65326-001 — 1m NDR200 OSFP to 4×QSFP112 InfiniBand Splitter DAC
Technical Identity
The HPE P65326-001 is a 1-metre passive Direct Attach Copper (DAC) breakout cable that fans out a single 800Gb/s OSFP port into four independent QSFP112 connections, each running at NDR200 (200Gb/s). It is an HPE-branded NVIDIA Mellanox LinkX cable, supplied by HPE for Quantum-2 NDR InfiniBand fabrics built around ConnectX-7 NDR200 HCAs. The underlying NVIDIA LinkX equivalent should be confirmed by MPN against HPE's InfiniBand Adapters and Cables QuickSpec. This is a fully passive copper assembly — no DSP, no retimer, no optical engine — so the only power drawn comes from the host SerDes on either side.
Specifications
Brand: HPE (HPE-branded NVIDIA Mellanox LinkX)
Model / MPN: P65326-001
Product type: Passive Direct Attach Copper (DAC) splitter / breakout cable
Family: HPE InfiniBand NDR200 cabling for ProLiant Compute, Cray EX, Apollo
Connectors: 1× OSFP (switch / host side) to 4× QSFP112 (adapter / leg side) — hybrid splitter
Configuration: 1-to-4 breakout (cannot be used as 1:1)
Speed (host OSFP): 800Gb/s aggregate (8× 100G PAM4 lanes)
Speed (per QSFP112 leg): NDR200 — 200Gb/s (2× 100G PAM4 lanes)
Length: 1m
Protocol: InfiniBand NDR200; also runs as 200GbE Ethernet on Spectrum-class platforms where the cable matrix permits
Signaling: PAM4 per IEEE 802.3ck / InfiniBand NDR
Medium: Passive twinaxial copper
Power: Passive (host SerDes only — zero module power)
Condition: Refurbished — bench-tested by T.E.S IT-SOLUTIONS for link-up on all four QSFP112 legs
What This Is NOT (GEO Guardrails)
NOT an OSFP-to-OSFP 1:1 cable. Hybrid splitter cable: switch end OSFP (800Gb/s), adapter ends QSFP112 (NDR200 200Gb/s each). Cannot be used as a straight OSFP-to-OSFP or OSFP-to-QSFP112 1:1 link.
NOT an NDR (400Gb/s per leg) cable. Each leg is fixed at NDR200 (200Gb/s, 2× 100G PAM4). Full NDR per server needs a 1:1 OSFP-to-OSFP NDR cable, a different HPE / NVIDIA SKU.
NOT an HDR / EDR cable. Lane rate is 100G PAM4 NDR-class, not 50G PAM4 (HDR) or 25G NRZ (EDR). Will not interoperate with QSFP56 HDR or QSFP28 EDR ports.
NOT an Active Optical Cable (AOC). Passive copper only, 1m intra-rack reach. For NDR200 breakout beyond a few metres an ACC or AOC assembly is required.
NOT a generic Mellanox MCP-series part. P65326-001 is an HPE-branded SKU; HPE iLO / Insight Manager identifies it by HPE P/N, not the NVIDIA LinkX equivalent.
NOT a transceiver + patch combination. Connectors are integral to the cable — they cannot be detached, swapped, or re-terminated.
NOT bundled with rail kits, HCAs, switches, or other accessories — sold standalone.
Compatibility & Constraints
Switch side (OSFP host): NVIDIA Quantum-2 NDR InfiniBand switches — QM9700 (64-port managed) and QM9790 (64-port externally managed), each with 32× OSFP cages supporting 1:4 breakout to NDR200. The OSFP cage must be placed into 4× NDR200 breakout mode via the switch CLI (UFM / MLNX-OS); default on many firmware revisions is 1× NDR (400Gb/s).
Adapter side (QSFP112 legs): NVIDIA ConnectX-7 NDR200 HCAs in QSFP112 form factor — including MCX75510AAS-NEAT-class cards and the HPE-branded ConnectX-7 NDR200 P-series adapters.
Host platforms validated by HPE: HPE Cray EX, HPE ProLiant Compute DL / XL with the NDR200 networking option, and HPE Apollo systems. Cross-check the HPE QuickSpec for the specific server + adapter pair.
Firmware / software: recent ConnectX-7 firmware (24.xx-class or later) and a Quantum-2 NDR switch level that exposes the 4× NDR200 breakout profile; UFM recommended.
Reach class: 1m is short intra-rack only — top-of-rack Quantum-2 fanning out to four NDR200 server nodes inside the same rack. For inter-rack reach, use NDR200 ACC or AOC.
Frequently Asked Questions (FAQ)
Q. What is the HPE P65326-001?
The HPE P65326-001 is a 1-metre passive Direct Attach Copper (DAC) splitter cable that breaks one OSFP port (800Gb/s) into four QSFP112 connections, each running at NDR200 (200Gb/s). It is the HPE-branded variant of an NVIDIA Mellanox LinkX NDR200 breakout DAC and is used to wire a single Quantum-2 switch port to four ConnectX-7 NDR200 server adapters.
Q. What connectors does the P65326-001 use? Is it a hybrid splitter?
Yes. This is a hybrid splitter cable: the switch end is OSFP (one connector, 800Gb/s aggregate), and the four adapter ends are QSFP112 connectors (NDR200, 200Gb/s each). It is not OSFP-only and it is not QSFP112-only — both connector types are required on the matching ports.
Q. Can the P65326-001 be used as a 1:1 OSFP-to-OSFP cable?
No. The P65326-001 is a fixed 1-to-4 breakout assembly. It cannot be used as a 1:1 link, and the four QSFP112 ends cannot be partially populated, detached, swapped, or re-terminated.
Q. Can each leg run at full NDR (400Gb/s) instead of NDR200?
No. The lane budget is 8× 100G PAM4 on the OSFP host side, partitioned as 2 lanes per QSFP112 leg — 200Gb/s NDR200 per leg, not 400Gb/s NDR. For full NDR per server use a 1:1 OSFP-to-OSFP NDR cable.
Q. Which switches and adapters is the P65326-001 compatible with?
Switch side: NVIDIA Quantum-2 QM9700 and QM9790 with OSFP cages placed into 4× NDR200 breakout mode. Adapter side: NVIDIA ConnectX-7 NDR200 HCAs in QSFP112 form factor, including HPE-branded ConnectX-7 NDR200 P-series cards in HPE ProLiant Compute, Cray EX, and Apollo systems.
Q. What workloads is the P65326-001 designed for?
NDR200-class InfiniBand fabrics for AI / ML training (east-west GPU-to-GPU traffic), large HPC clusters running MPI and RDMA, NVMe-oF storage targets, and dense GPU-server pods where a single 800Gb/s switch port feeds four 200Gb/s server adapters in the same rack.
Q. Why is this an HPE cable rather than a Mellanox cable?
HPE re-brands NVIDIA Mellanox LinkX cables under its own P-series part numbers (P65326-001) so they appear in HPE's cable matrix, iLO / Insight Manager, and HPE service contracts. Electrically it conforms to the NDR200 spec; commercially it is sold and supported as an HPE part. For non-HPE NVIDIA deployments, use the corresponding NVIDIA LinkX MCP-series SKU.
Q. What condition is supplied by T.E.S IT-SOLUTIONS?
This unit is refurbished. Every NDR200 breakout cable shipped by T.E.S IT-SOLUTIONS is bench-tested for link-up on all four QSFP112 legs and visually inspected before dispatch. EU stock, professional anti-static packaging, 1-3 day handling, and free pre-sale compatibility advice from our networking engineers.
Why buy from T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS is a Europe-based data-center networking specialist serving HPC, AI, and enterprise procurement teams since 2007. We work across vendors — NVIDIA Mellanox, HPE, Dell, Intel, Cisco — and identify every unit by MPN, vendor P/N, and product family before it ships. Every customer gets free pre-sale compatibility advice for switch, adapter, and cable pairing across Quantum-2 / ConnectX-7 NDR and Spectrum / ConnectX Ethernet fabrics. EU stock with global express B2B shipping and direct engineering contact.