Identity & Definition
This enterprise Ethernet OCP network adapter, the NVIDIA Mellanox MCX4431N-GCAN, is a ConnectX-4 Lx EN single-port 50GbE Ethernet adapter in OCP 2.0 mezzanine form factor with one SFP28 connector. This is an Ethernet-only adapter — it does not support InfiniBand. The OCP 2.0 form factor connects directly to the server motherboard via the OCP mezzanine slot. Condition: Refurbished — tested by T.E.S IT-SOLUTIONS.
Engineering Context
The ConnectX-4 Lx delivers 50GbE throughput through a single SFP28 port over a PCIe 3.0 x8 interface via the OCP 2.0 mezzanine connector. The OCP 2.0 form factor is designed for OCP-compliant servers where network adapters mount directly to the motherboard, freeing PCIe expansion slots for GPUs or other accelerators. The Lx variant supports RoCE v2 RDMA, VXLAN/NVGRE encapsulation, and SR-IOV (up to 64 VFs). The SFP28 port also supports backward-compatible 25GbE and 10GbE operation.
Deployment & Use Cases
50GbE server connectivity in OCP-compliant server platforms (Facebook, Microsoft, and other hyperscale designs). Cloud and hyperscale data centers using OCP server designs where PCIe slots must be preserved for GPU or storage accelerators. NVMe-oF and iSCSI storage connectivity at 50Gb/s with RoCE v2 RDMA. Virtualized VMware ESXi or KVM environments requiring SR-IOV for direct VM-to-NIC passthrough.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCX4431N-GCAN
ASIC: ConnectX-4 Lx
Type: Ethernet Network Adapter (OCP 2.0 Mezzanine)
Speed: 50GbE (also supports 25/10GbE)
Ports: 1x SFP28
Host Interface: PCIe 3.0 x8 (via OCP 2.0 connector)
RDMA: RoCE v2
SR-IOV: Up to 64 VFs
Form Factor: OCP 2.0 Mezzanine
Condition: Refurbished
Compatibility & Hard Constraints
OCP 2.0 Mezzanine Only: This adapter requires an OCP 2.0 mezzanine slot on the server motherboard. It does not fit standard PCIe expansion slots. For standard PCIe, use MCX4131A-GCAT or similar. Ethernet Only: ConnectX-4 Lx does not support InfiniBand. SFP28 Port: Accepts SFP28 (50GbE/25GbE) and SFP+ (10GbE) transceivers/cables. Does not accept QSFP modules. Single Port: One SFP28 port. For dual-port OCP 2.0, use MCX4421N-GCAN. Predecessor: ConnectX-3 Pro OCP adapters. Successor: ConnectX-5/ConnectX-6 OCP 3.0 adapters.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS tests every refurbished OCP adapter for mezzanine connector integrity, port-level connectivity, and firmware version before shipment. Technical consultation available for OCP server compatibility. Global shipping with tracking. 1–3 business day handling.