NVIDIA Mellanox ConnectX-5 MCX512A-ACAT

The NVIDIA Mellanox ConnectX-5 MCX512A-ACAT is a dual-port 25 Gigabit Ethernet network adapter from NVIDIA's widely deployed ConnectX-5 EN family, built around the MT27808A0-FCCF-EV controller and a PCIe 3.0 x8 host interface. It brings RDMA over Converged Ethernet (RoCE v2) to standard rack and blade servers for low-latency, CPU-efficient network I/O, alongside 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 round out a mature, field-proven feature set. This SKU is also shipped through select OEM channels, including a Lenovo-branded variant (02YG091), reflecting its broad adoption across server vendors. Distributed by MABLETECH, the MCX512A-ACAT is a cost-effective, low-profile 25GbE upgrade path for enterprises standardizing on RoCE-accelerated Ethernet fabrics for virtualization, storage, and general-purpose server networking without requiring PCIe 4.0 host support.