Mellanox NVIDIA CX4621A ConnectX-4 Lx Dual Port SFP28 25GbE OCP 3.0 Mezzanine PCIe 3.0 x8 Daughter Card Network Interface Card (NIC) MCX4621A-ACAB

The NVIDIA Mellanox ConnectX-4 Lx EN MCX4621A-ACAB is a high-performance dual-port 25 Gigabit Ethernet network adapter designed for modern data centers and enterprise server environments. Built in the OCP 3.0 (Open Compute Project) form factor, this NIC delivers low latency, high throughput, and advanced hardware offload capabilities to support cloud, virtualization, and high-performance computing workloads.

Powered by Mellanox’s industry-leading ConnectX-4 Lx architecture, this adapter supports 1GbE, 10GbE, and 25GbE connectivity over SFP28 ports, ensuring flexibility and seamless integration into existing and next-generation network infrastructures.

Key Specifications

• Model: NVIDIA Mellanox ConnectX-4 Lx EN

• Part Number: MCX4621A-ACAB

• Form Factor: OCP 3.0 mezzanine card

• Ports: 2 × SFP28

• Ethernet Speeds: 1GbE / 10GbE / 25GbE

• Host Interface: PCI Express 3.0 x8 (8.0 GT/s)

• Maximum Data Rate: 25 Gbps per port

• Power Consumption: ~7.5 W (typical ATIS load)

• Operating Temperature: 0°C to 55°C

• Dimensions: 115 mm × 76 mm (4.52 in × 2.99 in)

Advanced Features

• RDMA over Converged Ethernet (RoCE) hardware acceleration

• Ethernet stateless offload engines for reduced CPU utilization

• Overlay network offloads: VXLAN, NVGRE, and GENEVE

• Low-latency and high-bandwidth performance

• Host management support for enterprise monitoring and control

Ideal Use Cases

• Cloud and hyperscale data centers

• Virtualization and containerized environments

• High-performance computing (HPC)

• Software-defined networking (SDN)

• Storage and hyper-converged infrastructure

The NVIDIA Mellanox ConnectX-4 Lx EN MCX4621A-ACAB OCP 3.0 network adapter is an excellent choice for organizations seeking 25GbE performance, low latency, and advanced offload capabilities in a compact, power-efficient design optimized for modern server platforms.