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Green low-profile network card with two SFP28 ports and a full-height bracket attached

DELL

DELL 6XJXK ConnectX-6 Lx Dual 25GbE SFP28 LP network card

SKU CH-4RNY-ZSBR8

Adds dual 25GbE SFP28 low-profile connectivity to compatible Dell PowerEdge servers

  • TypeRack
  • Dual 25 GbE ports accelerate server-to-server traffic
  • SFP28 interfaces support direct-attach and optical modules
  • Low-profile bracket fits 1U and blade chassis
  • ConnectX-6 Lx controller offloads CPU-intensive networking tasks
  • Compatible with Dell PowerEdge R640, R650, R660, R740, R750, R760 and more

Dell ConnectX-6 Lx 25GbE dual-port card

This low-profile network adapter provides two 25GbE SFP28 ports for rack-mounted servers. It targets administrators upgrading Dell PowerEdge platforms to higher throughput without occupying a full-height slot. The ConnectX-6 Lx controller handles encryption and virtualization offloads in hardware. Buyers receive a tested unit with updated firmware.

Compatibility checklist before ordering

Confirm the target server appears in the supported PowerEdge list such as R640, R650, R6515, R660, R740, R750, R760, R840, R860, R940, R960, XR11 or XR12. Verify an available low-profile PCIe slot and matching SFP28 transceivers or direct-attach cables. Ensure the chassis airflow path suits a low-profile bracket installation. No full-height bracket is included.

Build quality and daily implications

The low-profile form factor fits dense 1U and 2U racks without blocking adjacent cards. Dual SFP28 cages accept optical or copper modules for flexible link distances. Passive cooling relies on server chassis fans, so verify slot airflow meets thermal requirements. Updated firmware reduces deployment surprises during driver installation.

Highlights

  • Dual 25 GbE ports accelerate server-to-server traffic
  • SFP28 interfaces support direct-attach and optical modules
  • Low-profile bracket fits 1U and blade chassis
  • ConnectX-6 Lx controller offloads CPU-intensive networking tasks
  • Compatible with Dell PowerEdge R640, R650, R660, R740, R750, R760 and more

Specifications

BrandDELL
Model6XJXK
TypeRack

Questions about this item

Does the 6XJXK card ship with SFP28 transceivers and cables, or must they be purchased separately?

The card provides two SFP28 cages only. Compatible 25 GbE transceivers and direct-attach cables are sold separately and must match your switch port type.

My server list shows both R650 and R660 models — does the 6XJXK work in either generation?

Yes. The 6XJXK is validated for Dell PowerEdge R650, R650XS, R660 and R660xs among many others, so either generation accepts the low-profile bracket.

What real throughput can I expect from the dual 25 GbE ports when the card is installed in a PowerEdge R750?

Each port delivers up to 25 Gbps line rate. With both ports active the aggregate ceiling is 50 Gbps, subject to CPU, PCIe lane allocation and switch capacity.

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