NVIDIA Mellanox ConnectX-5 MCX542B-ACUN OCP 2.0

The NVIDIA Mellanox ConnectX-5 MCX542B-ACUN 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 adds UEFI (x86/Arm) boot firmware to the standard MCX542B mezzanine design, enabling PXE network boot and bare-metal provisioning directly from adapter firmware on UEFI-based hyperscale platforms. 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-ACUN is well suited for hyperscale and OCP-standardized server fleets that require diskless, PXE-based OS deployment alongside dual 25GbE RoCE connectivity in a compact mezzanine footprint.