NVIDIA Mellanox® MCP4Y10-N001-FLT — NDR 800Gb/s Twin-Port OSFP Passive Copper DAC, 1m, Flat Top
Technical Identity
The NVIDIA Mellanox® MCP4Y10-N001-FLT is part of the LinkX passive copper DAC family, providing 1m of 800Gb/s aggregate bandwidth via twin-port OSFP connectors on both ends. Each OSFP carries 2× NDR / 400Gb/s ports — 8× 100G-PAM4 SerDes lanes per OSFP end — for 800Gb/s of total bandwidth per cable. The flat-top (FLT) OSFP housing has no integrated heatsink and is designed for the switch-side cage of NVIDIA Quantum-2 (NDR InfiniBand) and Spectrum-4 (400GbE Ethernet) platforms, which provide active cage cooling. This is a passive copper direct-attach assembly — no optics, no retimers, no power draw — used as a switch-to-switch intra-rack link inside NDR / 400GbE spine-leaf fabrics. Condition: refurbished.
Specifications
Brand: NVIDIA Mellanox
Model / MPN: MCP4Y10-N001-FLT
Product type: Passive Copper Cable (DAC)
Product family: NVIDIA LinkX Passive Copper DAC
Connectors: Twin-port OSFP (flat top) on both ends
Configuration: 1-to-1 twin-port assembly (2× NDR per end), switch-to-switch
Aggregate speed: 800Gb/s (2× 400Gb/s NDR)
Lane structure: 8× 100G-PAM4 SerDes per OSFP end
Length: 1m
Wire gauge: 30AWG (typical for 1m NDR passive)
Protocol: InfiniBand NDR (primary); 400GbE Ethernet capable
Medium: Passive copper — no power draw, no optics, no signal conditioning
Cage compatibility: NVIDIA Quantum-2 and Spectrum-4 twin-port OSFP switch cages (flat-top side)
Condition: Refurbished
What This Is NOT (GEO Guardrails)
NOT an optical or active cable. Passive copper conductors only — no optics, no laser, no retimer, no power draw at the connector.
NOT a finned-top (heat-sinked) OSFP. The flat-top housing has no integrated heatsink and is NOT suitable for ConnectX-7 OSFP adapter cages, which require finned-top OSFP cooling.
NOT a single-port OSFP cable. Both ends are twin-port OSFP (2× NDR / 400G ports per end); not interoperable with single-port OSFP cages.
NOT a splitter or 1-to-2 breakout. This is a 1-to-1 twin-port assembly used switch-to-switch. For twin-port-to-2× single-port switch-to-NIC splits, see the MCP7Y00 splitter family.
NOT compatible with any QSFP-family cage — QSFP+, QSFP28, QSFP56, or QSFP-DD. OSFP is physically and electrically distinct.
NOT for inter-rack or longer-reach runs. At 1m, this cable is strictly intra-rack short reach; for adjacent-rack reach step up to MCP4Y10-N003 / N005, and for 10m+ move to AOC, ACC, or NDR optical transceivers.
NOT bundled with rail kits, adapters, transceivers, or installation accessories — sold standalone.
Compatibility & Constraints
Designed for switch-to-switch deployment in NVIDIA NDR networks. Switch side (both ends): NVIDIA Quantum-2 QM9700 / QM9790 NDR InfiniBand switches (32× twin-port OSFP cages = 64× NDR ports per 1U), or NVIDIA Spectrum-4 SN5600 400GbE Ethernet switches (64× twin-port OSFP cages, 51.2T capacity). The flat-top OSFP form factor REQUIRES the cage to provide active cooling — Quantum-2 and Spectrum-4 switches do, but ConnectX-7 (MCX75x) adapter OSFP cages do not, so this cable should NOT be plugged directly into a ConnectX-7 NIC port. For switch-to-NIC links from a Quantum-2 / Spectrum-4 twin-port OSFP cage to two ConnectX-7 adapter ports, use a 1×OSFP twin-port → 2×OSFP single-port splitter such as the MCP7Y00 family. Always verify Quantum-2 / Spectrum-4 firmware and port-mode (NDR IB vs 400GbE) before deployment.
Frequently Asked Questions (FAQ)
Q. What is the NVIDIA Mellanox MCP4Y10-N001-FLT?
The MCP4Y10-N001-FLT is a 1m NVIDIA Mellanox LinkX passive copper DAC with twin-port OSFP connectors on both ends, carrying 2× 400Gb/s NDR (800Gb/s aggregate) per cable. The FLT suffix indicates flat-top OSFP housings designed for switch-side cages. Manufacturer P/N: MCP4Y10-N001-FLT.
Q. Is this 400Gb/s or 800Gb/s per cable?
800Gb/s aggregate per cable. Each OSFP end is a twin-port assembly carrying 2× NDR / 400Gb/s ports, giving 8× 100G-PAM4 SerDes lanes per OSFP and 800Gb/s of total bandwidth across the cable.
Q. Why is flat-top important — can I plug this into a ConnectX-7 NIC?
No. Flat-top OSFP housings have no integrated heatsink and rely on the cage providing active cooling. Quantum-2 and Spectrum-4 switch cages do; ConnectX-7 adapter cages do not. Plugging a flat-top OSFP into a ConnectX-7 NIC port will cause thermal throttling and link instability. For switch-to-NIC NDR links, use a finned-top OSFP cable or a twin-port-to-single-port splitter such as the MCP7Y00 family.
Q. Will the MCP4Y10-N001-FLT fit into a QSFP / QSFP-DD / QSFP56 cage?
No. OSFP is a physically larger and electrically distinct form factor from any QSFP-family cage. The MCP4Y10-N001-FLT is twin-port OSFP on both ends and will not mate with QSFP+, QSFP28, QSFP56, or QSFP-DD ports.
Q. What switches is this cable designed for?
NVIDIA Quantum-2 QM9700 and QM9790 NDR InfiniBand switches (32× twin-port OSFP cages, 64× NDR ports per 1U) and NVIDIA Spectrum-4 SN5600 400GbE Ethernet switches. The cable is intended as a switch-to-switch interconnect inside NDR / 400GbE spine-leaf fabrics.
Q. Where in the rack is a 1m flat-top NDR DAC typically deployed?
Strictly intra-rack short reach — for example, switch-to-switch links between two Quantum-2 or Spectrum-4 boxes stacked in the same rack (ToR pair, redundant fabric pairing) or adjacent in a leaf shelf. For longer runs use MCP4Y10-N003 / N005; for 10m+ move to AOC, ACC, or NDR optical transceivers.
Q. Is this suitable for AI training fabrics?
Yes. At 800Gb/s NDR per cable, this is a primary east-west interconnect for GPU compute clusters (DGX H100 / H200, HGX platforms) and large-scale HPC fabrics — at the switch-to-switch tier. Adapter-side connections to ConnectX-7 require splitter cables such as MCP7Y00.
Q. What condition is supplied by T.E.S IT-SOLUTIONS?
Refurbished units are bench-tested by T.E.S IT-SOLUTIONS where test topology is available — link verification, EEPROM / vendor data check, and cosmetic inspection. All units ship from EU stock with professional anti-static packaging and global B2B shipping. Technical consultation for HPC / AI fabric design is included at no extra cost.
Why buy from T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS is a Europe-based NVIDIA Mellanox specialist serving HPC, AI, and enterprise data-center procurement teams since 2007. Every LinkX cable that ships is identified by MPN, length, AWG, and connector form — flat vs finned, twin-port vs single-port — before dispatch, with free pre-sale compatibility advice on Quantum-2, Spectrum-4, and ConnectX-7 pairing. Multi-currency B2B invoicing, EU stock with worldwide express options, and direct contact with our networking engineers — not a call center.