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Green printed circuit board with silver PCIe edge connector and two small transceiver cages

Mellanox Technologies

Mellanox Technologies MCX4431A-GCAN 50GBase-X PCIe 3.0 x8 network card

SKU CH-DB3S-4WC7Q MPN MCX4431A-GCAN

50GBase-X network adapter with PCI Express 3.0 x8 interface for Open Compute Project

  • Speed50GBase-X
  • InterfacePCI Express 3.0 x8
  • FeaturesProduct Type:50Gigabit Ethernet Card
  • Weight0.15
  • 50 Gb/s throughput via 50GBase-X signalling
  • PCIe 3.0 x8 host interface for broad server compatibility
  • ConnectX-4 Lx controller built for OCP deployments
  • Lightweight 0.15 kg design eases dense rack installs
  • New condition, first listed by manufacturer June 2026

Mellanox ConnectX-4 Lx 50GbE Adapter

The Mellanox MCX4431A-GCAN is a ConnectX-4 Lx EN adapter built for the Open Compute Project form factor. It delivers a single 50GBase-X port over a PCI Express 3.0 x8 interface. The card weighs 0.15 kg and was first listed by the manufacturer in June 2026.

Suited for OCP hyperscale deployments needing 50

This adapter fits OCP-compliant servers and disaggregated storage clusters that require a single 50 GbE link. It is not for teams deploying standard half-height brackets in traditional racks, nor for environments limited to 25 GbE or lower switch ports.

Single-port 50GBase-X over PCIe 3.0 x8

The defining specification is the single 50GBase-X lane running on a PCIe 3.0 x8 bus. That combination fixes the maximum throughput and the slot requirement. Buyers must confirm their OCP chassis accepts this exact port count and electrical interface before ordering.

Highlights

  • 50 Gb/s throughput via 50GBase-X signalling
  • PCIe 3.0 x8 host interface for broad server compatibility
  • ConnectX-4 Lx controller built for OCP deployments
  • Lightweight 0.15 kg design eases dense rack installs
  • New condition, first listed by manufacturer June 2026

Specifications

BrandMellanox
ModelMCX4431A-GCAN
Speed50GBase-X
InterfacePCI Express 3.0 x8
FeaturesProduct Type:50Gigabit Ethernet Card
Weight0.15
Shipping weight0.91 kg
Package size127 × 76 × 51 mm

Questions about this item

How do I install this PCI Express 3.0 x8 card without bending the bracket?

Align the gold fingers with the slot, press straight down until the retention clip clicks, then secure the low-profile bracket screw before cabling.

What maintenance will the 50GBase-X transceiver need after deployment?

Inspect the optical ports quarterly for dust, clean with a lint-free swab and isopropyl alcohol, and reseat the module if link errors appear.

At what throughput does the PCI Express 3.0 x8 link become the bottleneck?

Sustained traffic above 50 Gbit/s saturates the eight-lane gen 3.0 bus, so the host interface limits peak throughput first.

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