NVIDIA Mellanox ConnectX-5 MCX515A-CCAT

The NVIDIA Mellanox MCX515A-CCAT is a single-port 100 Gigabit Ethernet adapter from the ConnectX-5 EN family, built around the MT27808A0-FCCF-EV controller and connecting to the host over a PCIe 3.0 x16 interface. It is one of the most widely deployed ConnectX-5 SKUs, offering hardware-accelerated RoCE v2 RDMA for low-latency, CPU-efficient networking in enterprise, cloud, and storage environments. The single-port QSFP28 design provides a cost-effective entry point into 100GbE for servers that need high-bandwidth uplinks without the expense of a dual-port card, while retaining the full ConnectX-5 offload engine set for RDMA-accelerated storage and virtualization workloads. This SKU is also distributed under an HP OEM variant (MCX515A-CCAT_C11), reflecting its broad server-vendor validation. As a mature, field-proven member of the ConnectX-5 generation, it remains a reliable choice for organizations standardizing on 100GbE Ethernet fabrics.