NVIDIA Mellanox MCP1650-H002 QSFP56 HDR 200Gb/s Passive Copper DAC 2m: This is a 2m passive direct attach copper (DAC) cable engineered for NVIDIA InfiniBand HDR 200Gb/s point-to-point fabric interconnects. The cable uses twinax conductors with QSFP56 connectors on both ends. This is a passive copper assembly with no signal conditioning — it is not an active copper cable, not an active optical cable, and not a transceiver. This is a refurbished unit.
Engineering Context
The MCP1650-H002 is purpose-built for short, ultra-low-latency HDR InfiniBand fabric interconnects in AI/ML training clusters and HPC compute pods. Passive copper DACs add zero retiming latency, a critical property for RDMA-heavy collectives at the QSFP56 layer. HDR 200Gb/s uses 4x50G PAM4 lane signalling per the IBTA specification. At 2m the cable is well within the passive copper reach budget for HDR signalling. The LSZH jacket reduces fire risk in dense rack environments.
Deployment & Use Cases
NVIDIA Quantum QM8700 / QM8790 HDR switch leaf-to-spine within a rack. ConnectX-6 HDR HCA to switch uplinks in DGX A100 and HGX systems. SuperPOD-style HDR fabric interconnects across adjacent rack units. GPU-to-GPU GPUDirect RDMA fabric segments. NCCL-tuned all-reduce paths between training nodes.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCP1650-H002
Form Factor: QSFP56 to QSFP56
Cable Type: Passive Copper DAC
Data Rate: HDR 200Gb/s (4x50G PAM4)
Protocol: InfiniBand HDR (200Gb/s)
Compatible Down-Rate: EDR 100Gb/s on supported port configurations
Length: 2m
Jacket: LSZH (Low Smoke Zero Halogen)
Connector Type: Latching QSFP56
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Hard Constraints
Compatible with NVIDIA Quantum QM8700 / QM8790 HDR switches and ConnectX-6 / ConnectX-6 VPI HCAs in InfiniBand mode. Requires switch ports configured for HDR (200Gb/s) — does not auto-rate to EDR without explicit port configuration on some firmware revisions. Not for use as an Ethernet 200GbE cable on Ethernet-only switches; that is the V-series part. Fixed 2m point-to-point cable; no breakout. Not an active cable; reach is bounded by passive copper budget at HDR signalling.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS tests every passive DAC for connector continuity, mechanical condition, and link integrity at rated speed before shipment. We provide expert consultation on high-speed fabric cabling, global shipping, and 1–3 day handling. Visit tes-itsolutions.com to learn more.