NVIDIA Mellanox MCA4J80-N003-FTF 400Gb/s NDR Active Copper Cable, OSFP Flat-to-Finned, 3m: This is a 3-meter Active Copper Cable (ACC) with OSFP connectors in a Flat-to-Finned (FTF) configuration, engineered for NVIDIA Quantum-2 InfiniBand NDR fabrics and 400Gb/s Ethernet links. One end uses a Flat-Top OSFP and the other end uses a Finned-Top (Riding Heat Sink, RHS) OSFP, allowing connection between Flat-Top NIC ports and Finned-Top switch ports without an adapter. This is a copper-based active cable, not an optical cable; it is also not a passive DAC. NVIDIA P/N: 980-9I601-00N003. This is a new, factory-sealed unit.
Engineering Context
Active Copper Cables include integrated redriver circuitry on each connector to compensate for copper signal loss at NDR data rates, extending reliable reach beyond what passive DACs (typically 1.5m or less at 400G NDR) can achieve. The Flat-to-Finned mechanical design addresses thermal-profile mismatches between NVIDIA NDR-class NICs (ConnectX-7, BlueField-3 OSFP, often Flat-Top) and Quantum-2 switches (QM9700/QM9790, requiring RHS finned cages). The cable carries 4 differential lanes at 100Gb/s PAM4 each per port for 400Gb/s aggregate.
Deployment & Use Cases
Short-reach 400G NDR spine-leaf links between Quantum-2 switches and Flat-Top NDR adapters. AI training cluster fabric where DGX/HGX nodes use Flat-Top OSFP NICs and the switch tier uses RHS cages. HPC fabric upgrades from HDR to NDR where mixed Flat/Finned port populations must coexist. NVMe-oF and GPUDirect Storage backends over InfiniBand NDR.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number (MPN): MCA4J80-N003-FTF
NVIDIA P/N: 980-9I601-00N003
Cable Type: Active Copper Cable (ACC)
Connector: OSFP — Flat-Top to Finned-Top (RHS)
Data Rate: 400Gb/s NDR per port
Signaling: 4 lanes × 100Gb/s PAM4
Length: 3 meters
Protocol: InfiniBand NDR / 400GbE
Condition: New — Factory-sealed
Compatibility & Hard Constraints
Compatible with NVIDIA Quantum-2 switches (MQM9700, MQM9790) on the Finned-Top end and with ConnectX-7 / BlueField-3 OSFP Flat-Top adapters on the Flat-Top end. Both endpoints must be configured for NDR (or autoneg to NDR). Not compatible with cages that require the same form factor on both ends — verify your NIC and switch port styles before ordering. Not interchangeable with QSFP-DD or QSFP112 ports without a media converter. As an active copper cable, total reach beyond 3m is not supported by this part number.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS verifies link establishment and signal integrity at NDR rates on every active cable before shipment. We provide compatibility consultation for mixed Flat-Top / Finned-Top OSFP deployments, global shipping with handling time of 1–3 business days, and direct technical support for AI/HPC fabric design. Visit www.tes-itsolutions.com for the full inventory.