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Green circuit board with two silver SFP28 ports and gold edge connector

DELL

DELL Mellanox ConnectX-4 Lx CX4421A Dual 25GbE SFP28 OCP 2.0 expansion card

SKU CH-HWWK-VER03

Adds dual 25 GbE SFP28 connectivity via OCP 2.0 for high-speed server networking

  • TypeRack
  • Dual 25 GbE ports deliver high-throughput server connectivity
  • SFP28 interface supports 28 Gbps lane speed for modern optics
  • OCP 2.0 form factor fits dense rack-mount chassis
  • ConnectX-4 Lx controller provides hardware offload for efficient packet processing

Dual-port 25GbE server adapter

The DELL Mellanox ConnectX-4 Lx CX4421A adds two 25GbE SFP28 ports to an OCP 2.0 slot, giving rack-mounted servers high-speed Ethernet connectivity for storage and compute clusters. It ships new with firmware updated and tested.

Sustained throughput on both ports

The dual-port design maintains line-rate 25GbE traffic across extended transfers without throttling, supporting consistent bandwidth for distributed workloads and storage replication. OCP 2.0 form factor ensures compatibility with compliant server chassis.

Highlights

  • Dual 25 GbE ports deliver high-throughput server connectivity
  • SFP28 interface supports 28 Gbps lane speed for modern optics
  • OCP 2.0 form factor fits dense rack-mount chassis
  • ConnectX-4 Lx controller provides hardware offload for efficient packet processing

Specifications

BrandDELL
ModelT3CYH
TypeRack

Questions about this item

How much power does the ConnectX-4 Lx CX4421A draw when running at 25 GbE all day?

The dual-port 25 GbE adapter is rated for typical operation within the OCP 2.0 power envelope; exact watts depend on cable length and traffic mix.

Which slot and transceiver types are required to use the CX4421A?

It fits an OCP 2.0 mezzanine slot and needs two SFP28 modules or direct-attach cables for the dual 25 GbE ports.

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