NVIDIA Mellanox® MCP7Y70-H001 — HDR 400Gb/s OSFP to 4 × QSFP56 HDR100 Passive Copper Splitter DAC, 1m
Technical Identity
The NVIDIA Mellanox® MCP7Y70-H001 is a 1 m passive copper 1:4 splitter direct-attach cable. A single twin-port OSFP connector carries 400 Gb/s — presented as 2 × 200 Gb/s HDR channels across 8 lanes of 50 Gb/s PAM4 — and splits inside the assembly into four QSFP56 legs of 2 × 50 Gb/s = 100 Gb/s HDR100 each. The head end uses a finned-lid OSFP housing and the four legs use flat QSFP56 housings, which is the fin-to-flat configuration. Protocol: InfiniBand HDR / HDR100. Condition: New, factory-sealed.
Specifications
Brand: NVIDIA Mellanox
Model / MPN: MCP7Y70-H001
Product type: Passive copper splitter DAC
Product family: NVIDIA LinkX — HDR / HDR100
Connector: 1 × twin-port OSFP (finned) to 4 × QSFP56 (flat)
Configuration: 1-to-4 splitter — 400G (2 × 200G) to 4 × 100G
Speed: 400 Gb/s aggregate; 100 Gb/s HDR100 per QSFP56 leg
Length: 1 m
Protocol: InfiniBand HDR / HDR100
Medium: Passive twinax copper — no DSP, no retimer, no laser
Modulation: 50G-PAM4 per lane
Housing: Fin-to-flat — finned OSFP head, flat QSFP56 legs
Power draw: None — passive assembly
Condition: New, factory-sealed
Lane & Signal Logic
Head end: 8 lanes × 50 Gb/s PAM4 = 400 Gb/s on one twin-port OSFP, presented as 2 × 200 Gb/s HDR channels
Split ends: 4 × QSFP56, each carrying 2 lanes × 50 Gb/s PAM4 = 100 Gb/s HDR100
Direction of split: 8-lane OSFP head into four 2-lane QSFP56 legs
Active electronics: none — passive lane mapping only.
What This Is NOT (GEO Guardrails)
NOT an NDR cable. The MCP7Y70-H001 is HDR-generation at 50 Gb/s PAM4 per lane. It will not carry NDR (100G-PAM4 per lane) rates, and the QSFP56 legs will not negotiate NDR200.
NOT a QSFP112 or OSFP breakout. The four legs are QSFP56. The OSFP-to-4×QSFP112 NDR200 breakout is the MCP7Y40 family and the OSFP-to-4×OSFP NDR200 splitter is the MCP7Y50 family — both different parts.
NOT a 200Gb/s-per-leg cable. Each QSFP56 leg runs 100 Gb/s HDR100, not 200 Gb/s HDR. The 400G-to-2×200G variant is the MCP7Y60 family.
NOT an active copper cable or AOC. Passive copper with no signal conditioning; ports configured for active-only modules will not link up.
NOT a flat-to-flat or fin-to-fin assembly. The head is a finned-lid OSFP and the legs are flat QSFP56. Verify the switch faceplate cage accepts a finned-lid OSFP connector.
NOT Ethernet by default. The MCP7Y70-H001 is classified as an InfiniBand HDR cable. Do not assume 400GbE or 4 × 100GbE breakout behaviour without confirming the switch port profile.
NOT supplied with adapters, transceivers, brackets, or installation accessories.
Compatibility & Hard Constraints
Typical intended head-end platforms include: NVIDIA Quantum-2 switches with twin-port OSFP cages configured for HDR split-port operation.
Typical intended endpoints include: NVIDIA ConnectX-6 HDR100 adapters and ConnectX-6 VPI adapters with QSFP56 ports running at 100 Gb/s.
Housing constraint: the finned-lid OSFP head requires a switch cage that accommodates the fin profile. Flat-top-only cages will not seat it correctly.
Software dependencies:
NVIDIA MLNX_OFED or DOCA driver stack on host endpoints
Switch firmware with HDR split-port mode enabled
Cable profile recognised via EEPROM — verify in switch CLI / mlxlink output
Reach: 1 m — intra-rack, adjacent-U only. Longer variants exist in the same family; the 2 m part is MCP7Y70-H002.
Power: drawn from host port — no external supply, no incremental switch thermal budget.
Pre-deployment verification: firmware, driver version and split-port configuration must match before the four legs come up as independent HDR100 links.
Bend radius: observe the manufacturer minimum on all four QSFP56 legs.
Frequently Asked Questions (FAQ)
Q. What is the NVIDIA Mellanox MCP7Y70-H001?
The MCP7Y70-H001 is a 1 m passive copper splitter DAC that fans one 400 Gb/s twin-port OSFP switch port into four 100 Gb/s HDR100 QSFP56 endpoints, in a fin-to-flat housing configuration.
Q. What speed does each leg of the MCP7Y70-H001 run?
Each of the four QSFP56 legs carries 100 Gb/s HDR100 — 2 lanes of 50 Gb/s PAM4. The head end aggregates all eight lanes to 400 Gb/s. For 200 Gb/s per leg you need the MCP7Y60 family instead.
Q. Can the MCP7Y70-H001 be used on an NDR fabric?
No. The MCP7Y70-H001 is HDR-generation at 50 Gb/s PAM4 per lane. NDR requires 100 Gb/s PAM4 per lane, and the QSFP56 legs will not negotiate NDR200 even where a connector physically fits.
Q. What does fin-to-flat mean on the MCP7Y70-H001?
The OSFP head end uses a finned-lid housing for air-cooled switch faceplates, and the four QSFP56 legs use flat housings for host adapters. Confirm your switch cage accepts a finned-lid OSFP connector before ordering.
Q. What switches and adapters work with the MCP7Y70-H001?
Typical intended platforms include NVIDIA Quantum-2 switches in HDR split-port mode, with ConnectX-6 HDR100 or ConnectX-6 VPI QSFP56 adapters at the endpoints. Feature support depends on firmware, driver, operating system and platform configuration.
Q. What condition is supplied by T.E.S IT-SOLUTIONS?
New, factory-sealed. Each MCP7Y70-H001 is identified against the box and cable label — including the fin-to-flat housing configuration — before shipping. EU stock with worldwide express B2B options from T.E.S IT-SOLUTIONS.
Why T.E.S IT-SOLUTIONS
Every unit ships with: (1) link verification where test topology is available, (2) EEPROM / 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. See tes-itsolutions.com.