NVIDIA Mellanox ConnectX-4 MCX4421A-ACUN OCP2.0
Dual-Port 25GbE SFP28 OCP 2.0 Mezzanine Adapter, PCIe 3.0 x8
Host Interface
PCIe 3.0 x8
Form Factor
OCP 2.0 Mezzanine Card
Port Count
2-port
Port Speed & Connector Type
25GbE, SFP28
RDMA / Network Protocol
RoCE v2 (RDMA over Converged Ethernet)
Product Description
The NVIDIA Mellanox ConnectX-4 Lx EN MCX4421A-ACUN is a dual-port 25 Gigabit Ethernet network adapter built in the OCP 2.0 mezzanine form factor, designed for space-constrained hyperscale and cloud server platforms that standardize on the Open Compute Project specification. Based on the ConnectX-4 Lx EN controller (MT27712A0-FDCF-AE), the card connects to the host over a PCIe 3.0 x8 interface and delivers up to 25Gb/s per port through SFP28 connectors, with RDMA over Converged Ethernet (RoCE v2) offload for low-latency, low-CPU-overhead data movement. UEFI support enables the adapter to participate in standard server boot and firmware management flows. As a member of the ConnectX-4 Lx generation, the card is well suited to top-of-rack 25/50GbE network fabrics, offering hardware packet-processing offloads that free host CPU cycles for application workloads. It is a common building block in hyperscale web-tier, cloud, and virtualization deployments where OCP mezzanine slots are standard.