NVIDIA Mellanox® MCP1660-W001 (NVIDIA P/N 980-9I35O-00W001) is a passive copper Direct Attach Cable (DAC) for 400GbE Ethernet point-to-point links. It IS a 1:1 QSFP-DD to QSFP-DD DAC; it IS NOT a splitter, breakout cable, or InfiniBand cable, and it IS NOT an active or optical cable. Condition: New.
Engineering Context. The cable carries 8 lanes of 50Gb/s PAM4 across QSFP-DD on both ends, conformant with IEEE 802.3cd 400GBASE-CR8 short-reach copper Ethernet. This SKU is the 1m, 30AWG variant. As a passive copper DAC it draws no host power for the cable assembly itself and adds negligible latency.
Deployment & Use Cases. Top-of-rack and middle-of-row 400GbE links between Spectrum-3 / Spectrum-4 switches and 400GbE-capable NICs (e.g., ConnectX-6 Dx, ConnectX-7 in Ethernet mode) within the same rack. Typical workloads: AI training fabric Ethernet uplinks, GPU server cluster aggregation, and east-west traffic between leaf and spine switches over short copper runs.
Technical Specifications.
Cable type: Passive copper DAC
Topology: QSFP-DD to QSFP-DD (point-to-point, 1:1)
Data rate: 400GbE
Lane structure: 8 x 50Gb/s PAM4
Standard: IEEE 802.3cd 400GBASE-CR8
Length: 1m
Conductor gauge: 30AWG
Power draw (cable): None (passive)
NVIDIA Part Number: 980-9I35O-00W001
Compatibility & Constraints. Compatible with QSFP-DD ports on NVIDIA Spectrum-3 / Spectrum-4 switches and ConnectX adapters operating in 400GbE Ethernet mode. NOT compatible with InfiniBand HDR/NDR ports, OSFP ports, or QSFP56/QSFP112 cages. Reach is fixed at 1m; for longer copper runs, choose a higher-AWG variant (e.g., 26AWG) or move to an AOC.
Why TES. Sourced and tested by T.E.S IT-SOLUTIONS. See tes-itsolutions.com. Handling time 1-3 business days; worldwide shipping with tracking.