NVIDIA Mellanox ConnectX-4 MCX4131A-BCAT

The NVIDIA Mellanox ConnectX-4 Lx EN MCX4131A-BCAT is a single-port 40 Gigabit Ethernet adapter card built around the ConnectX-4 Lx EN controller (MT27711A0-FDCF-BE), delivering high-throughput connectivity over a QSFP28 port on a PCIe 3.0 x8 host interface. The card supports RDMA over Converged Ethernet (RoCE v2), offloading data transport from the host CPU to reduce latency and free processor cycles for application workloads. As a cost-effective member of the ConnectX-4 Lx generation, it is designed for enterprise and cloud server deployments that need 40GbE-class bandwidth without the premium cost of full ConnectX-4 EN silicon, and it retains hardware packet-processing offloads such as stateless checksum and segmentation offload. The MCX4131A-BCAT is a standard low-profile PCIe add-in card suited to general-purpose rack servers, making it a practical upgrade path from 10GbE for data centers scaling east-west bandwidth or preparing storage networks for RoCE-based protocols.