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Green printed circuit board with two SFP28 cages and a gold PCIe x8 edge connector

Mellanox Technologies

Mellanox Technologies MCX4421A-ACQN ConnectX-4 Lx EN 25GbE dual-port SFP28 network card

SKU CH-A87T-0DWE1 MPN MCX4421A-ACQN

Dual-port 25 GbE SFP28 adapter on PCIe 3.0 x8 for high-speed networking

  • TypePCIE Wi-Fi Adapter
  • 25 GbE throughput per port for high-speed networking
  • Dual SFP28 ports deliver 25 GbE connectivity each
  • PCIe 3.0 x8 host interface provides ample bandwidth
  • ConnectX-4 Lx EN controller handles 25 GbE line rate
  • Supplied without bracket for flexible mounting options

25GbE dual-port SFP28 server adapter

This Mellanox ConnectX-4 Lx EN card adds two 25 gigabit Ethernet ports to a server or workstation. It targets administrators who need high-throughput, low-latency networking for storage clusters, virtualisation hosts or high-performance computing nodes.

Verify PCIe 3.0 x8 slot and SFP28 transceiver stock

Your motherboard must provide a full-length PCIe 3.0 x8 electrical connection; smaller slots will limit bandwidth. The card ships without a mounting bracket, so confirm your chassis can secure a bracket-less adapter. You also need two SFP28 transceivers or direct-attach cables, which are not included.

Sustained 25GbE throughput

Under continuous load the ConnectX-4 Lx engine maintains line-rate 25GbE on both ports while offloading checksum, segmentation and virtualisation tasks to hardware. The design omits active cooling, so adequate chassis airflow is required to keep the controller within thermal limits during prolonged transfers.

Highlights

  • 25 GbE throughput per port for high-speed networking
  • Dual SFP28 ports deliver 25 GbE connectivity each
  • PCIe 3.0 x8 host interface provides ample bandwidth
  • ConnectX-4 Lx EN controller handles 25 GbE line rate
  • Supplied without bracket for flexible mounting options

Specifications

BrandMellanox Technologies
TypePCIE Wi-Fi Adapter
Shipping weight0.45 kg
Package size320 × 305 × 61 mm

Questions about this item

Does the MCX4421A-ACQN include SFP28 transceivers or cables, or must they be purchased separately?

The card provides two SFP28 ports; transceivers and cables are not included and must be sourced separately.

Is the MCX4421A-ACQN offered in different speed or port-count versions that I need to choose between?

This model is a fixed 25 GbE dual-port configuration; no alternative speeds or port counts are listed for this MPN.

What does the 25 GbE rating mean for actual throughput when the card is installed in a PCIe 3.0 x8 slot?

Each port can carry up to 25 Gb/s; the PCIe 3.0 x8 host interface provides sufficient bandwidth to sustain line rate on both ports simultaneously.

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