NVIDIA Mellanox® MCP4Y10-N001-FLT — 800Gb/s Passive Copper DAC, OSFP Flat-Top, 1m

Technical Identity
The NVIDIA Mellanox® MCP4Y10-N001-FLT is an 800Gb/s passive copper Direct Attach Cable (DAC) with flat-top OSFP connectors on both ends and a fixed 1m reach. It belongs to NVIDIA's LinkX MCP4Y10 family — the canonical short-reach copper interconnect for the Quantum-X800 (XDR InfiniBand) and Spectrum-X800 (800GbE Ethernet) generation. Signaling runs at 8 lanes × 100Gb/s PAM4 per direction for a full 800Gb/s aggregate per cable end. The cable is dual-protocol: the same physical assembly is certified for XDR InfiniBand and 800GbE Ethernet, with the active protocol selected by the link partners rather than by the cable itself.

Specifications

OEM: NVIDIA Mellanox (LinkX)
Part Number (MPN): MCP4Y10-N001-FLT
Category: Passive Copper DAC, OSFP flat-top both ends
Protocols: XDR InfiniBand and 800GbE Ethernet (dual-spec)
Aggregate speed: 800Gb/s per cable end (8× 100Gb/s PAM4)
Connectors: OSFP flat-top, both ends
Signal type: Passive — no retimer, no DSP, no power draw beyond EEPROM read
Length: 1m
Topology: 1-to-1 straight cable (not a splitter)
Diagnostics: I²C-readable EEPROM with vendor data on each end
Condition: New, factory-sealed


What This Is NOT

NOT an AOC. This is solid twin-axial copper — no optical engine, no power conversion, no laser. For optical reach beyond ~5m at 800G, use the corresponding active or AOC SKUs in the LinkX 800G family.
NOT a finned-top OSFP cable. Both ends are flat-top OSFP. For switch-side connections where the port relies on the cage to dissipate heat (typical for Quantum-3 and Spectrum-4 front-panel ports), use the finned-top or hybrid finned/flat MCP4Y10 variant instead.
NOT a splitter or breakout. 1× OSFP to 1× OSFP straight assembly only — no 2× 400G QSFP112/OSFP breakout. For breakout, see the MCP7Y00 / MCP7Y40 splitter SKUs.
NOT NDR. NDR is 400Gb/s (4× 100G PAM4) on QSFP112 or OSFP; this is the next-generation 800Gb/s class (XDR / 800GbE) on OSFP only.
NOT a transceiver. Fixed cable assembly — the OSFP ends are not field-replaceable optics.


Compatibility

Adapter / SuperNIC side: NVIDIA ConnectX-8 SuperNIC, which exposes flat-top OSFP cages on the adapter — the primary intended use case for the -FLT variant.
Switch side (flat-OSFP scenarios): systems or breakout configurations that present flat-top OSFP on the host-facing side. For Quantum-3 (XDR InfiniBand, MQM97xx-class) and Spectrum-4 SN5600 / SN5400 (800GbE Ethernet) front-panel ports, the finned-top OSFP variant of MCP4Y10 is the standard choice — verify the mechanical cage spec of the target port before ordering.
Protocols: XDR InfiniBand and 800GbE Ethernet, selected by the link partners (HCA / switch ASIC), not by the cable.
Reach: 1m — fixed; intra-chassis and intra-rack adapter-to-adapter or short top-of-rack runs only.
Power: none required; cable is fully passive.


Frequently Asked Questions (FAQ)
Q. What is the NVIDIA Mellanox MCP4Y10-N001-FLT?
The MCP4Y10-N001-FLT is an 800Gb/s passive copper DAC cable with flat-top OSFP connectors on both ends and a 1m length, supporting both XDR InfiniBand and 800GbE Ethernet.
Q. Is this cable XDR InfiniBand or 800GbE Ethernet?
Both. The MCP4Y10 family is dual-protocol — certified for XDR InfiniBand and 800GbE Ethernet on the same physical assembly. The active protocol is determined by the HCA and switch ASIC at the two ends, not by the cable.
Q. What is the difference between the -FLT variant and the standard MCP4Y10-N001?
The -FLT suffix indicates flat-top OSFP connectors on both ends, designed primarily for ConnectX-8 SuperNIC adapter-to-adapter links and other host-side flat-OSFP scenarios. The non-FLT MCP4Y10-N001 uses finned-top OSFP, which is the correct choice for connections into Quantum-3 or Spectrum-X800 switch ports that do not provide their own cage heatsink.
Q. Does this cable need power?
No. It is fully passive — no retimer, no DSP, no host power draw beyond the standard low-current EEPROM read. Lowest possible latency for an 800G link.
Q. Is the unit new or refurbished?
New, factory-sealed, in original NVIDIA packaging where included. Every unit is bench-tested by T.E.S IT-SOLUTIONS prior to dispatch.

Why T.E.S IT-SOLUTIONS
Every MCP4Y10-N001-FLT shipped from T.E.S IT-SOLUTIONS is bench-tested for link establishment, EEPROM read, and port-by-port traffic validation on representative XDR / 800GbE topology. Professional anti-static packaging, EU stock, global B2B shipping, and free pre-sale technical consultation for ConnectX-8, Quantum-X800, and Spectrum-X800 cluster builds — direct access to engineering, not a call-center.