MCP1650-V003E26 QSFP/CX7 Cable — 200G QSFP56 Passive DAC, 3m – NVIDIA DGX Spark Compatible

EEPROM coded for NVIDIA / Mellanox ConnectX-7

NVIDIA DGX Spark compatible — 200G QSFP56 passive DAC cable, 3 m

→ DGX Spark interconnect reference — approved part numbers, real-world throughput, and what to buy at two, three and four or more nodes.

Part Number: MCP1650-V003E26 (NVIDIA / Mellanox equivalent)
Description: QSFP56 Passive Direct Attach Copper (DAC) cable, 200G-rated, 3 m (9.8 ft)

The MCP1650-V003E26 is the 3 m version of our MCP1650-V00AE30 DGX Spark cable: the same QSFP56 connectors, the same 200GbE Ethernet coding and the same ConnectX-7 compatibility, with the most reach. Three metres is the longest length NVIDIA offers in a passive 200G QSFP56 copper cable, which makes it the choice for runs across a full rack or to a switch on another shelf. Past 3 m, move to an active optical cable or transceivers.

At this length the cable uses thicker 26 AWG conductors to keep the signal clean, which is why the part number ends in E26 rather than E30. Each ConnectX-7 QSFP port on the DGX Spark operates at up to 200 Gb/s, which this 200G cable matches exactly. Because the NVIDIA GB10 reference design is shared across the ecosystem, the same cable also works on the OEM GB10 systems, including the Dell Pro Max with GB10, HP ZGX Nano AI Station and ASUS Ascent GX10.

Watch the part number. There is no MCP1650-V003E30. The 3 m Ethernet cable is only made in 26 AWG, and NVIDIA's InfiniBand HDR line (MCP1650-H) stops at 2 m, so MCP1650-V003E26 is the only NVIDIA 3 m passive 200G QSFP56 cable.

• 2 units: one cable, port to port. No switch.
• 3 units: three cables in a ring, using both QSFP ports on every unit. Still no switch.
• 4 units, no switch: four cables in a ring. It works, but it needs a custom NCCL topology and NVIDIA does not support it. How it's done →
• 4 or more units with a switch: the supported route. One cable per unit into a QSFP-DD switch port, with each port pinned to 200G.

• No transceivers or adapters required, and no switch for two or three units
• 26 AWG cable is thicker and stiffer than the shorter 30 AWG lengths, so plan the route and avoid tight bends near the connectors
• The ConnectX-7 QSFP ports operate in Ethernet mode (with RoCE), not InfiniBand
• On a switch, set each connected port to 200G manually. Left on auto-negotiate, links commonly settle at 50G
• Works across the GB10 ecosystem, which shares the same ConnectX-7 200GbE networking
• The physical location and labeling of the ConnectX-7 port can differ by chassis, so confirm the port location in your vendor manual before cabling

You have two or more NVIDIA DGX Spark systems (or GB10-based equivalents). You need to reach a switch or another unit up to 3 m away through the ConnectX-7 QSFP ports, and you want a passive 200G QSFP56 copper cable that runs at the full 200 Gb/s the port supports, with no optics to power or manage.

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