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Green PCB network card, dual QSFP56 ports, tall bracket, PCIe x16 edge connector

NVIDIA

NVIDIA ConnectX-6 Dx MCX623106AN-CDAT 100GbE dual-port QSFP56 PCIe 4.0 x16 network card

SKU CH-SAET-2MAZX MPN MCX623106AN-CDAT

A dual-port 100 Gbps Ethernet adapter with two QSFP56 connectors on a PCIe 4.0 x16 slot

  • Rated speed100 Gbit/s
  • Interface typePCIe 4.0 x16
  • Connection types2 x QSFP56
  • Key featuresConnectX-6 Dx EN adapter card, 100GbE, Dual-port QSFP56, PCI
  • 100Gbps throughput over optical fiber with 100GBase-X technology
  • Dual-port QSFP56 design adds two network connections in one PCIe 4.0 x16 slot
  • ConnectX-6 Dx EN adapter delivers 100GbE performance for server and workstation workloads
  • Tall bracket form factor fits standard full-height expansion slots
  • No Crypto variant simplifies deployment where encryption offload is not required

Dual-port 100GbE QSFP56 adapter

The NVIDIA ConnectX-6 Dx MCX623106AN-CDAT is a PCIe 4.0 x16 network card that delivers two 100Gbps ports over optical fibre. It targets data-centre servers and high-performance workstations that need dense, low-latency connectivity in a single expansion slot.

Sustained 100Gbps throughput over fibre

Optical 100GBase-X links maintain the full 100Gbps rate across longer runs without the signal degradation seen on copper at this speed. Dual QSFP56 ports share the x16 lane budget, so each port can run at line rate continuously under heavy east-west traffic or storage replication workloads.

Replaces dual single-port 100GbE cards

Consolidating two ports into one tall-bracket card frees a second PCIe slot and reduces cabling complexity. The upgrade makes sense when a server chassis has limited x16 slots or when a rack layout benefits from fewer transceiver modules and fibre patch cords.

How it compares

Measured against everything we stock in Ethernet Cards & NICs, at today’s prices. Recalculated every night.

Price $1,270.99
Pricier than about 91% of the 1,505 comparable items (median $90.99).

Specifications

Product
Brand nameNVIDIA
Model nameMCX623106AN-CDAT
Performance
Rated speed100 Gbit/s
Ports & slots
Interface typePCIe 4.0 x16
Connection types2 x QSFP56
Size & build
Shipping weight0.45 kg
Package size190 × 161 × 26 mm

Questions about this item

Does the ConnectX-6 Dx card run hot or draw much power when it sustains 100 Gbps traffic all day?

The PCIe 4.0 x16 interface provides ample headroom for 100 Gbps line-rate traffic, and the tall-bracket design allows standard server airflow to keep the adapter within its thermal envelope.

Which cables or transceivers must I already have to use the dual QSFP56 ports?

Each port accepts a QSFP56 transceiver or direct-attach cable rated for 100GBase-X optical fiber; two matching modules are required to activate both links.

Will this adapter work in an older server that only has PCIe 3.0 slots?

The card is a PCIe 4.0 x16 device; it will negotiate down to PCIe 3.0 x16 if installed in a 3.0 slot, reducing maximum throughput to the 3.0 lane limit.

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