NVIDIA Mellanox MCA4J80-N024 800Gb/s InfiniBand NDR Active Copper Cable, OSFP, 2.4m: This is a 2.4 meters active copper cable (ACC) engineered for 800Gb/s aggregate bandwidth across a straight OSFP-to-OSFP link, carrying twin-port NDR signaling between NVIDIA Quantum-2 InfiniBand endpoints. Internal redriver electronics draw power from the host OSFP cage; this is not a passive DAC and not a breakout or splitter assembly. Condition: New — Factory-sealed.
Engineering Context
The MCA4J80-N024 occupies the operating window where passive DAC has exhausted its electrical headroom but optical AOCs are not yet justified by reach. Its 2.4m reach is suited to next-rack and skip-rack OSFP NDR links where passive DAC headroom is exhausted. The active redrivers compensate for high-frequency copper loss so that the 2 × 400Gb/s NDR lanes inside the OSFP connector remain within the InfiniBand specification at 800Gb/s aggregate. Conductor gauge is thinner than passive copper, easing bend radius and rack dressing in dense GPU cabinets. Because the cable is port-powered, the host OSFP cage must provision the higher ACC power budget; this is supported on Quantum-2 switches and ConnectX-7 / BlueField-3 OSFP adapters.
Deployment & Use Cases
Adjacent and cross-row interconnects between NVIDIA Quantum-2 MQM9700 modular and MQM9790 fixed switches in InfiniBand spine-leaf fabrics. ConnectX-7 OSFP and BlueField-3 OSFP NIC uplinks from compute nodes to top-of-rack switches where DAC reach is insufficient. AI training clusters of the DGX/HGX class requiring OSFP NDR fabric between cabinets. HPC batch-compute fabrics, GPUDirect Storage paths, and NVMe-oF over InfiniBand backends.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCA4J80-N024
Cable Type: Active Copper Cable (ACC), port-powered redriver
Connector: OSFP to OSFP (twin-port NDR, straight, point-to-point)
Aggregate Data Rate: 800Gb/s (2 × 400Gb/s NDR lanes inside one OSFP)
Protocol: InfiniBand NDR (Quantum-2 fabric)
Length: 2.4m
Topology: Straight OSFP-to-OSFP (not a splitter/breakout)
Power Source: Host OSFP cage (ACC requires the host ACC power budget)
Condition: New — Factory-sealed
Compatibility & Constraints
Compatible with NVIDIA Quantum-2 platforms (MQM9700 modular and MQM9790 fixed switches) and OSFP NDR adapters such as ConnectX-7 OSFP and BlueField-3 OSFP DPUs that support ACC modules. Not a splitter — does not break 800G into 2 × 400G discrete OSFP ends; 1:2 breakout topologies require a different MCA4J80 splitter P/N. Not compatible with Ethernet-only switches that do not implement OSFP NDR. The host port must support the ACC power class; passive-DAC-only cages will not power the cable. OSFP housing form factor (RHS finned-top vs. Flat-Top) must match the destination hardware datasheet; mixing housings can prevent insertion or block thermal contact.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS is a B2B specialist in NVIDIA Mellanox InfiniBand and Ethernet networking for AI, HPC, and cloud customers. Every cable is electrically validated for NDR signaling and redriver behaviour before shipment. Visit https://www.tes-itsolutions.com for full inventory. Handling time is 1–3 business days with worldwide tracked delivery.