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Mellanox ConnectX-3 dual SFP+ network card silver bracket

Mellanox Technologies

Mellanox MCX312A-XCBT ConnectX-3 10 40 Gigabit Ethernet network card

SKU CH-6CVS-1X3EP

Delivers 10 and 40 Gigabit Ethernet over PCI Express 3.0 for high-bandwidth server and storage workloads

  • 10 and 40 Gigabit Ethernet speeds for high-bandwidth server connectivity
  • PCI Express 3.0 interface reduces CPU transport load in virtualised environments
  • ConnectX-3 EN architecture accelerates clustered database and HPC workloads
  • Single and dual SFP+ port options fit flexible data-centre topologies
  • Enterprise-grade Ethernet NIC built for storage and high-frequency trading apps

ConnectX-3 10/40GbE adapter

The Mellanox MCX312A-XCBT is a ConnectX-3 EN network interface card built for servers and storage systems that require 10 or 40 Gigabit Ethernet throughput. It targets enterprise data centres, high-performance computing clusters and embedded deployments where low latency and high bandwidth matter. The card plugs into a PCI Express 3.0 slot to serve clustered databases, web infrastructure and high-frequency trading workloads.

Dual SFP+ ports and PCIe 3.0

The board presents SFP+ connectors so you can choose the optical or direct-attach cables that match your rack layout. A PCI Express 3.0 x8 interface feeds the controller, keeping CPU transport overhead low even in heavily virtualised environments. The low-profile bracket fits standard server chassis without blocking adjacent slots, and the passive cooling design suits dense 1U or blade enclosures where airflow is managed by the system.

Verify slot width and SFP+ optics

Confirm the host server has a free PCIe 3.0 x8 or wider slot; a x4 link will reduce available bandwidth. Ensure the power budget of the chassis covers the card’s draw under full load. You must supply compatible SFP+ transceivers or DAC cables rated for 10 GbE or 40 GbE operation, as none are included. Check that your switch ports and cabling support the desired speed before ordering.

Highlights

  • 10 and 40 Gigabit Ethernet speeds for high-bandwidth server connectivity
  • PCI Express 3.0 interface reduces CPU transport load in virtualised environments
  • ConnectX-3 EN architecture accelerates clustered database and HPC workloads
  • Single and dual SFP+ port options fit flexible data-centre topologies
  • Enterprise-grade Ethernet NIC built for storage and high-frequency trading apps

Specifications

BrandMellanox Technologies

Questions about this item

What PCI Express standard does the ConnectX-3 MCX312A-XCBT use, and what bandwidth limit does that set?

The card uses PCI Express 3.0, which caps practical throughput at the lane count installed in the server.

What physical slot and bracket does the MCX312A-XCBT need to fit in a server chassis?

It requires a PCI Express 3.0 slot and a full-height bracket for the SFP+ port cage.

How is the MCX312A-XCBT installed, and what step is often missed?

Seat the card firmly in the PCI Express 3.0 slot, secure the bracket screw, then attach compatible SFP+ transceivers and cables before powering on.

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