NVIDIA Mellanox ConnectX-5 MCX512F-ACAT

The NVIDIA Mellanox ConnectX-5 MCX512F-ACAT is a dual-port 25 Gigabit Ethernet network adapter from the ConnectX-5 EN family, built on the MT27808A0-FCCF-EV controller with a PCIe 3.0 x16 host interface. The wider x16 edge connector fits standard full-height PCIe slots and provides ample headroom above the card's 50Gb/s aggregate throughput, simplifying slot planning in servers without dedicated x8 bifurcation. It supports RDMA over Converged Ethernet (RoCE v2) for low-latency, CPU-efficient network I/O, hardware storage acceleration for NVMe-oF targets, and SR-IOV for dense virtualization. Quality-of-service controls, CPU offload engines, jumbo frame support, NC-SI sideband connectivity, LLDP, and QCN congestion notification complete a mature, field-proven feature set. Distributed by MABLETECH, the MCX512F-ACAT is well suited for standard rack servers where an x16 mechanical slot is available and administrators want straightforward 25GbE RoCE connectivity without needing UEFI boot or out-of-band host management features.