NVIDIA Mellanox ConnectX-5 EN MCX545B-GCUN OCP2.0
Single-Port 50GbE OCP 2.0 Ethernet Adapter with UEFI
Host Interface
PCIe 3.0 x16
Port Count
1-port
Port Speed & Connector Type
50G QSFP28
Form Factor
OCP 2.0 mezzanine card
Network Protocol / RDMA
Ethernet, RoCE v2
Product Description
The NVIDIA Mellanox ConnectX-5 EN MCX545B-GCUN is a single-port 50 Gigabit Ethernet adapter built on the OCP 2.0 mezzanine form factor, connecting through a PCIe 3.0 x16 host interface. Its QSFP28 port delivers 50GbE connectivity with hardware-accelerated RoCE v2 RDMA for low-latency, CPU-efficient data movement across storage and compute fabrics. Unlike some ConnectX-5 SKUs, this card includes UEFI-based firmware, enabling pre-boot network configuration, PXE boot deployment, and Secure Boot compatibility on modern server platforms — a valuable capability for automated OS provisioning and diskless boot environments. The card also supports NVMe-oF storage offload, SR-IOV network virtualization, and overlay network acceleration. As an OCP 2.0 mezzanine card, it mounts directly to the motherboard connector, making it well suited for hyperscale and OEM server designs standardized on that legacy mezzanine format.