NVIDIA Mellanox MCP7Y10-N003 800G OSFP to 2x 400G QSFP112 NDR Passive Copper Hybrid Breakout DAC, 3 meters: This is a 3 meters passive copper Direct Attach Cable (DAC) that splits a single 800G OSFP InfiniBand NDR switch port into two independent 400G QSFP112 NDR400 downlinks. This is a fixed-length passive twinax assembly with no DSPs, retimers, or optics. This is a downlink fanout cable, not an aggregation or end-to-end interconnect. This is a new unit.
Engineering Context
The MCP7Y10-N003 bridges OSFP-only 800G NDR switches with QSFP112-only 400G endpoints. OSFP 800G carries 8 lanes of 100G PAM4; each QSFP112 leg receives 4 lanes for 400Gb/s NDR400 operation. Passive copper introduces no DSP latency and consumes zero port power, making it preferred for AI synchronization workloads, HPC collective operations, and scale-out training where deterministic latency matters. Conductor is 28 AWG with an LSZH (Low Smoke Zero Halogen) jacket. At 3 meters, the cable operates near the upper practical reach of passive copper for 100G PAM4 per lane; routing must respect minimum bend radius and avoid sharp vertical compression.
Deployment & Use Cases
Quantum-2 NDR switch downlinks to ConnectX-7 400G adapters in AI training clusters and GPU pods. Phased 800G rollouts where switch fabric runs OSFP 800G but compute nodes use QSFP112 400G NICs. Row-level fanout where 1m DACs are insufficient and 3m bridges adjacent racks. HPC systems prioritizing deterministic latency for collective operations such as AllReduce and AllGather.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCP7Y10-N003
NVIDIA P/N: 980-9I80P-00N003
Cable Type: Passive Copper Hybrid Breakout DAC (Twinax)
Topology: OSFP (800G NDR) to 2x QSFP112 (400G NDR400)
Protocol: InfiniBand NDR / NDR400
Signaling: PAM4, 100Gb/s per lane
Length: 3 meters
Conductor: 28 AWG
Jacket: LSZH (Low Smoke Zero Halogen)
Condition: New — Factory-sealed when available, full pre-shipment electrical validation by T.E.S IT-SOLUTIONS
Compatibility & Constraints
Compatible with NVIDIA Quantum-2 NDR switches (OSFP) configured for split / breakout mode, and with QSFP112 endpoints such as ConnectX-7 400G adapters. Not compatible with QSFP56 HDR 200G adapters or QSFP28 EDR / 100G adapters (different connector and lane structure). Not compatible with QSFP-DD ports. Switch port must be configured for 2x400G breakout in the InfiniBand subnet manager. Fixed 3m length, no field re-termination. At 3m the assembly is at the upper edge of passive copper reach for 100G PAM4 — sustained operation requires controlled bend radius and clean cable tray paths.
Why T.E.S IT-SOLUTIONS
Every cable is electrically validated for PAM4 lane integrity, fanout mapping, and connector condition before shipment. T.E.S IT-SOLUTIONS ships worldwide with secure packaging and offers expert consultation on InfiniBand NDR fabric topology and breakout configuration. Standard handling time is 1-3 business days.