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Green circuit board with silver metal bracket, two SFP28 ports and gold PCI-E edge connector

Mellanox Technologies

Mellanox ConnectX-4 CX4121A-XCAT 2-Port 10GbE SFP28 PCI-E network card

SKU CH-Q695-WYBQR

Dual-port 10 GbE SFP28 PCI-E network card for high-speed server connectivity

  • Dual-port design doubles 10 GbE throughput with SFP28 connectivity
  • PCI Express interface provides low-latency server integration
  • ConnectX-4 controller handles 10/25 GbE speeds efficiently
  • Two SFP28 cages support flexible fibre or copper transceivers
  • New condition ensures full manufacturer specifications from 2026

Dual-port 10GbE SFP28 adapter

The Mellanox ConnectX-4 CX4121A-XCAT adds two 10GbE SFP28 ports to a server or workstation through a PCI Express slot. It targets administrators who need low-latency connectivity for storage clusters, virtualisation hosts or high-frequency trading platforms.

PCIe x8 host interface with SFP28 cages

The card occupies a single PCIe x8 lane and presents two SFP28 cages for direct-attach copper or optical transceivers. This layout leaves adjacent slots free for additional accelerators or storage controllers while delivering line-rate throughput on both ports simultaneously.

Consistent throughput under sustained load

Hardware-based flow control and congestion management keep both 10GbE links stable during prolonged traffic bursts. The design avoids thermal throttling in dense chassis, so throughput remains predictable for backup windows, database replication or real-time analytics workloads.

Highlights

  • Dual-port design doubles 10 GbE throughput with SFP28 connectivity
  • PCI Express interface provides low-latency server integration
  • ConnectX-4 controller handles 10/25 GbE speeds efficiently
  • Two SFP28 cages support flexible fibre or copper transceivers
  • New condition ensures full manufacturer specifications from 2026

Specifications

No published specifications for this item yet.

Questions about this item

Will the PCI-E interface cap sustained 10 GbE throughput on both ports?

Each port runs at 10 GbE and the card uses a PCI-E slot; total bandwidth depends on the slot generation and lane count in your system.

How much heat does the card produce during all-day operation?

The adapter has no active cooler, so it relies on chassis airflow; power draw is low enough for standard server cooling.

Which SFP28 transceivers or direct-attach cables must I already own?

The card accepts any SFP28 module or DAC rated for 10 GbE; choose single-mode, multi-mode or copper to match your link distance.

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