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Green circuit board, tall metal bracket, two QSFP28 ports, gold PCIe x16 edge connector

Mellanox Technologies

Mellanox Technologies MCX516A-GCAT 50GbE Dual-port QSFP28 PCIe 3.0 x16 network card

SKU CH-5Q4E-55QBV MPN MCX516A-GCAT

Dual-port 50 GbE QSFP28 card with PCIe 3.0 x16 host interface and sub-600 ns latency

  • Dual 50 GbE ports double server bandwidth
  • Sub-600 ns latency accelerates HPC workloads
  • PCIe 3.0 x16 interface delivers 16 lanes of throughput
  • QSFP28 cages accept 100 G optical modules
  • Low-profile 2.7 × 5.6 in card fits dense chassis

ConnectX-5 EN 50GbE dual-port adapter

The Mellanox MCX516A-GCAT is a new ConnectX-5 EN network interface card built for servers that need two 50GbE connections over QSFP28 optical media. It plugs into a PCIe 3.0 x16 slot and uses a tall bracket form factor measuring 2.7 by 5.6 inches. The adapter supports 50GBase-R4 signalling and is RoHS R6 compliant for environmentally friendly deployment.

Suits high-throughput server clusters.

This card targets machine-learning clusters, data-analytics platforms and HPC environments that rely on RoCE RDMA, MPI offloads and NVMe over Fabric acceleration. It is not for desktop PCs or workstations lacking a full-height PCIe 3.0 x16 slot and QSFP28 cabling infrastructure. Buyers who need copper twinax media or single-port 100GbE density should evaluate other models.

Dual QSFP28 ports at 50GbE each

The decisive specification is the two QSFP28 ports rated for 50GbE apiece, delivering an aggregate 100GbE bandwidth over optical fibre. Confirm that your switch and cabling support 50GBase-R4 before purchase.

Highlights

  • Dual 50 GbE ports double server bandwidth
  • Sub-600 ns latency accelerates HPC workloads
  • PCIe 3.0 x16 interface delivers 16 lanes of throughput
  • QSFP28 cages accept 100 G optical modules
  • Low-profile 2.7 × 5.6 in card fits dense chassis

Specifications

BrandMellanox Technologies Inc.
Shipping weight0.10 kg
Package size196 × 155 × 38 mm

Questions about this item

Does the PCIe 3.0 x16 interface cap each 50GbE port at 50 Gb/s?

Yes, the x16 lane width provides enough bandwidth for both ports to run at line rate without bottleneck.

Will the 5.6 inch depth and tall bracket fit my 2U server chassis?

The card measures 2.7 inches wide by 5.6 inches deep and ships with a tall bracket, so it fits standard full-height server slots.

Do I need to install OFED drivers before the card appears in the OS?

Most modern Linux kernels include the mlx5 driver, so the adapter is detected on boot; install OFED only if you need RDMA or NVMe over Fabrics features.

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