NVIDIA Mellanox ConnectX-4 MCX416A-BCAT
Dual-Port 40/56GbE QSFP28 Adapter, PCIe 3.0 x16
Host Interface
PCIe 3.0 x16
Port Count
2-port
Port Speed & Connector Type
40GbE/56GbE, QSFP28 (56GbE requires Mellanox switch)
RDMA / Network Protocol
RoCE v2 (RDMA over Converged Ethernet)
Controller / ASIC
MT27708A0-FDCF-CE (ConnectX-4 EN)
Product Description
The NVIDIA Mellanox ConnectX-4 EN MCX416A-BCAT is a dual-port 40/56 Gigabit Ethernet adapter card built on the ConnectX-4 EN controller (MT27708A0-FDCF-CE), pairing two QSFP28 ports with a full PCIe 3.0 x16 host interface. The wide x16 connection provides sufficient host bandwidth to drive both ports near line rate simultaneously, making this card a common choice for high-throughput enterprise, cloud, and HPC-adjacent servers that need dual-homed 40/56GbE connectivity without host-side bottlenecks. When paired with a Mellanox switch, each port can operate at 56GbE Ethernet speed. The card supports RDMA over Converged Ethernet (RoCE v2) for low-latency, CPU-efficient data transport and inherits the ConnectX-4 EN generation's hardware offload capabilities. As the highest-bandwidth configuration in this ConnectX-4 EN legacy adapter lineup, the MCX416A-BCAT suits servers with demanding east-west traffic, storage networking, or dual-fabric redundancy requirements.