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Green PCB network card, dual QSFP28 ports, tall metal bracket

Mellanox Technologies

Mellanox Technologies MCX516A-CCAT 100GbE dual-port QSFP28 PCIe 3.0 x16 network card

SKU CH-ZJHY-4WYBP MPN MCX516A-CCAT

Dual-port QSFP28 adapter delivers 100 GbE over PCIe 3.0 x16 with sub-600 ns latency and NVMe over Fabric offloads

  • Weight0.48
  • Dual 100 Gb/s ports for maximum throughput
  • PCIe 3.0 x16 SerDes at 8.0 GT/s bandwidth
  • Sub-600 ns latency accelerates HPC workloads
  • RoCE RDMA offloads reduce CPU overhead
  • Low-profile 2.71 in x 5.6 in fits dense servers

ConnectX-5 EN dual 100GbE card

The MCX516A-CCAT delivers two ports of 100Gb Ethernet over QSFP28 connectors, backed by a PCIe 3.0 x16 interface running at 8.0GT/s. Sub-600 ns latency and very high message rate suit machine learning, data analytics and HPC workloads that demand maximum throughput.

Verify PCIe 3.0 x16 slot and QSFP28 cabling

Your motherboard must expose a full x16 electrical link at Gen 3.0; smaller slots will limit bandwidth. Each port requires a compatible QSFP28 transceiver or direct-attach cable rated for the desired 10, 25, 40, 50 or 100 Gb/s speed.

Tall bracket fits standard chassis

The card measures 2.71 in by 5.6 in (68.90mm x 142.24mm) with a tall bracket, so confirm your case or server slot spacing accommodates that height. Power draw and thermal output scale with active link speed; ensure chassis airflow matches the installed configuration.

Highlights

  • Dual 100 Gb/s ports for maximum throughput
  • PCIe 3.0 x16 SerDes at 8.0 GT/s bandwidth
  • Sub-600 ns latency accelerates HPC workloads
  • RoCE RDMA offloads reduce CPU overhead
  • Low-profile 2.71 in x 5.6 in fits dense servers

Specifications

BrandMELLANOX
Weight0.48
Shipping weight0.23 kg
Package size193 × 157 × 38 mm

Questions about this item

Does the MCX516A-CCAT ship with QSFP28 transceivers or cables, or must they be purchased separately?

The card provides two QSFP28 cages; transceivers or direct-attach cables are not included and must be sourced to match the link speed and reach required.

Should I select a different ConnectX-5 model if my server only has PCIe x8 slots?

This MCX516A-CCAT requires a PCIe 3.0 x16 slot; a card with an x8 edge connector would be needed for x8-only backplanes.

What does the 100 Gb/s per port rating mean once the card is installed in a PCIe 3.0 x16 system?

Each port can run at 10, 25, 40, 50 or 100 Gb/s; the x16 interface at 8.0 GT/s provides enough throughput for both ports at line rate with sub-600 ns latency.

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