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Full-height network adapter with dual QSFP ports, silver bracket, green circuit board

DELL

DELL 71C1T Mellanox ConnectX-5 Ex CX516A Dual 100Gb QSFP FH Adapter

SKU CH-FA9Y-AR6VW

Dual-port 100Gb QSFP full-height adapter for Dell PowerEdge R540, R640, R6525, R740, R740XD, R740XD2, R7425, R7515, R7525, R840, R940, R940XA, T640, XR2 servers

  • Product typeRack
  • Dual 100Gb QSFP ports deliver high-throughput connectivity
  • ConnectX-5 Ex CX516A controller enables low-latency data transfer
  • Full-height bracket fits standard rack-mount server slots
  • Tested components with updated firmware ensure reliable operation
  • Compatible with PowerEdge R540, R640, R740, R840, R940 and more

Dual 100Gb QSFP Adapter for Dell PowerEdge

The DELL 71C1T Mellanox ConnectX-5 Ex CX516A is a full-height network adapter built for Dell PowerEdge servers. It provides two 100Gb QSFP ports for high-throughput server interconnects and storage fabrics. The card targets administrators upgrading R640, R740, R740XD, R7515, R7525, R840, R940, R940XA, T640, R6525, R7425, XR2 or R540 platforms.

Low-profile thermal design for dense racks

The full-height bracket fits standard server airflow paths without blocking adjacent slots. Passive cooling relies on chassis fans, so acoustic output matches the host system rather than adding its own noise. Power draw scales with link utilisation, staying within the thermal envelope Dell validates for the supported PowerEdge models.

Firmware-ready for immediate deployment

Each unit ships with updated firmware and tested components, reducing bring-up time in validated Dell environments. Dual QSFP cages accept direct-attach copper or optical transceivers for flexible reach. The adapter is not suited for workstations lacking PCIe x16 electricals or for builds requiring single-port or lower-speed connectivity.

How it compares

Measured against everything we stock in Rack & Tower Servers, at today’s prices. Recalculated every night.

Price $571.99
Cheaper than about 91% of the 17,641 comparable items (median $1,910.99).

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Specifications

Product
Brand nameDELL
Model name71C1T
Product typeRack

Questions about this item

How do I install the 71C1T adapter into a Dell PowerEdge R740, and which step is often missed?

Insert the full-height bracket into an available PCIe slot, secure the retention screw, then attach the QSFP cables; the step often missed is confirming the server BIOS recognises both 100Gb ports before deploying workloads

What maintenance or replacement will the 71C1T adapter need over time?

The adapter itself has no user-serviceable parts; plan to replace QSFP transceivers or cables if link errors appear, and re-apply firmware updates when Dell releases new ConnectX-5 Ex bundles for the R640 or R7525 platforms

What limit appears first when the 71C1T runs sustained 100Gb traffic on a PowerEdge R940?

The PCIe slot generation and lane count in the R940 set the practical ceiling; if the slot cannot supply enough bandwidth for dual 100Gb ports, throughput will plateau at the bus level before the adapter reaches its rated speed

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