NVIDIA Mellanox ConnectX-5 MCX542B-ACAN OCP 2.0

The NVIDIA Mellanox ConnectX-5 MCX542B-ACAN is a dual-port 25 Gigabit Ethernet network adapter from the ConnectX-5 EN family, delivered in the OCP 2.0 mezzanine form factor with a PCIe 3.0 x8 host interface for tool-less installation in Open Compute Project-compliant server chassis. Built on the MT28808A0-FCCF-EV controller, it connects through the OCP mezzanine connector rather than a conventional PCIe slot, and its x8 interface provides ample bandwidth headroom for the card's 50Gb/s aggregate throughput while keeping motherboard routing simpler than the x16 variant. It supports RDMA over Converged Ethernet (RoCE v2) for low-latency, CPU-efficient network I/O, inheriting the broader ConnectX-5 EN architecture's hardware offload capabilities for overlay networks and RDMA-accelerated storage access. Distributed by MABLETECH, the MCX542B-ACAN is well suited for hyperscale and OCP-standardized server platforms whose motherboard design uses an x8-lane OCP mezzanine slot.