NVIDIA Mellanox ConnectX-5 MCX545B-CCUN OCP2.0

The NVIDIA Mellanox MCX545B-CCUN is a single-port 100 Gigabit Ethernet network adapter in the OCP 2.0 (Open Compute Project) form factor, part of the ConnectX-5 EN family and built on the MT28808A0-FCCF-EV controller. Designed for OCP-compliant server chassis, it mounts directly onto the motherboard's OCP mezzanine slot via a PCIe 3.0 x16 interface, freeing standard PCIe expansion slots for other add-in cards — a common requirement in hyperscale and cloud-optimized server designs. The card includes UEFI-enabled firmware for pre-boot network initialization and delivers hardware-accelerated RoCE v2 RDMA for low-latency, low-CPU-overhead networking. As an OCP-form-factor member of the widely deployed ConnectX-5 generation, the MCX545B-CCUN is well suited to hyperscale and cloud data centers standardizing on OCP server platforms for space-efficient, high-density 100GbE connectivity.