NVIDIA Mellanox ConnectX-4 Lx EN MCX4421A-XCQN OCP2.0
Dual-Port 10GbE OCP 2.0 Mezzanine Adapter Card
Host Interface
PCIe 3.0 x8
Port Count
2-port
Port Speed & Connector Type
10GbE, SFP28 (backward compatible with SFP+), per port
Form Factor
OCP 2.0 mezzanine card
Network Protocol / RDMA
Ethernet with RoCE v2 (RDMA over Converged Ethernet)
Product Description
The NVIDIA Mellanox ConnectX-4 Lx EN MCX4421A-XCQN is a dual-port 10 Gigabit Ethernet adapter in the Open Compute Project (OCP) 2.0 mezzanine form factor, built for space-constrained hyperscale and cloud server designs that predate the OCP 3.0 specification. Connecting via a PCIe 3.0 x8 host interface and built around the MT27712A0-FDCF-XE controller, it delivers the same RoCE v2 hardware-accelerated RDMA transport as other ConnectX-4 Lx EN cards, packaged into a mezzanine card that mounts directly onto the motherboard rather than a chassis slot. This form factor remains widely deployed in OCP 2.0-based server fleets where board real estate and airflow are tightly managed, giving operators a proven, standardized 10GbE networking option compatible with their existing OCP 2.0 chassis and motherboard designs.