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

Mellanox Technologies

Mellanox Technologies MCX631102AN-ADAT 25Gbps dual SFP28 PCIe 4.0 x8 network card

SKU CH-HRX0-42N80 MPN MCX631102AN-ADAT

Dual-port 25Gbps SFP28 adapter with PCIe 4.0 x8 connectivity and a tall bracket

  • Speed25Gbps
  • Connectors2 x SFP28
  • InterfacePCIe 4.0 x8
  • FeaturesConnectX-6 Lx EN adapter card, 25GbE, Dual-port SFP28, PCIe
  • 25Gbps throughput for high-speed server networking
  • Dual SFP28 ports enable redundant or aggregated links
  • PCIe 4.0 x8 interface delivers low-latency bandwidth
  • ConnectX-6 Lx EN adapter offloads packet processing
  • Tall bracket fits standard full-height chassis slots

Dual-port 25GbE adapter for PCIe 4.0 servers

The Mellanox MCX631102AN-ADAT is a ConnectX-6 Lx EN network card that delivers two 25Gbps SFP28 ports over a PCIe 4.0 x8 interface. It targets data-centre and high-performance computing hosts that need low-latency 25GbE connectivity without cryptographic offload. The tall bracket fits standard full-height server chassis. Buyers needing Fibre Channel, InfiniBand or 10GBASE-T copper ports should select a different adapter.

Verify slot width bracket height

Confirm the host has a free PCIe 4.0 x8 or wider slot; the card will negotiate down in narrower slots but bandwidth will be limited. Ensure the chassis accepts a tall bracket — low-profile brackets are not included. Source SFP28 transceivers or direct-attach cables separately; the card ships without optics. Check that your switch ports are configured for 25GbE and that the operating system includes or can load the appropriate ConnectX-6 Lx driver.

Tall bracket simplifies rack installs no crypto

The supplied tall bracket lets the card mount directly in common 1U and 2U servers without an extra bracket kit. Absence of crypto offload reduces firmware attack surface and simplifies driver maintenance for environments that handle encryption in software. Dual SFP28 cages allow link aggregation or separate storage and compute fabrics. No cables transceivers or software media are bundled.

Highlights

  • 25Gbps throughput for high-speed server networking
  • Dual SFP28 ports enable redundant or aggregated links
  • PCIe 4.0 x8 interface delivers low-latency bandwidth
  • ConnectX-6 Lx EN adapter offloads packet processing
  • Tall bracket fits standard full-height chassis slots

Specifications

BrandMellanox
ModelMCX631102AN-ADAT
Speed25Gbps
Connectors2 x SFP28
InterfacePCIe 4.0 x8
FeaturesConnectX-6 Lx EN adapter card, 25GbE, Dual-port SFP28, PCIe 4.0 x8, No Crypto, Tall Bracket
Shipping weight2.47 kg
Package size190 × 161 × 26 mm

Questions about this item

Does the MCX631102AN-ADAT include SFP28 transceivers or cables in the box?

The card ships with a tall bracket installed; SFP28 transceivers or direct-attach cables are not included and must be purchased separately.

The card has two 25Gbps SFP28 ports — when would I use both versus a single port?

Use both ports for link aggregation, separate storage and compute networks, or high-availability failover; a single port is sufficient for a simple 25GbE uplink.

What does the 25Gbps rating mean for actual throughput on a PCIe 4.0 x8 slot?

Each port can deliver up to 25Gbps line rate; the x8 interface provides ample headroom so neither port is bottlenecked by the bus.

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