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Low-profile PCIe card with two QSFP+ ports and a metal bracket

C&N

C&N ST7288 Mellanox ConnectX-3 Dual-Port QSFP+ 40GbE Network Card

SKU CH-02P0-K89H6

Dual-port 40GbE QSFP+ card with PCIe 3.0 x8, RoCE, SR-IOV up to 127 VFs and FDR-14 InfiniBand support

  • Rated speed10 GB/s
  • Interface typeEthernet
  • Supported standardsEthernet
  • Connection typesEthernet
  • Bus interfaceEthernet
  • Key featuresDesktop
  • Dual-port 40GbE and FDR-14 InfiniBand deliver up to 56Gbps bandwidth
  • PCIe 3.0 x8 host interface with 2.0 and 1.1 compatibility
  • RDMA and RoCE support achieve latency as low as 1 microsecond
  • SR-IOV provides up to 127 virtual functions for virtualised servers
  • Low-profile form factor with 2U bracket fits dense data-centre racks

Dual-port 40GbE QSFP+ server NIC

The C&N ST7288 is a Mellanox ConnectX-3 network card built for enterprise data centres and high-performance computing clusters. It delivers two 40Gb Ethernet ports or FDR-14 InfiniBand links through a PCIe 3.0 x8 host interface, targeting workloads that demand high throughput and low latency.

PCIe 3.0 x8 bandwidth ceiling

The card plugs into a PCIe 3.0 x8 slot and remains compatible with PCIe 2.0 and 1.1, but the slot generation limits total throughput to the bandwidth of eight third-generation lanes. Each QSFP+ port runs at up to 40Gb Ethernet or 56Gbps InfiniBand, so the bus can become the bottleneck before the ports saturate.

Low-profile build with two QSFP+ cages

A low-profile bracket and 2U bracket are included, allowing the 0.254 kg card to fit in dense 1U or 2U chassis. Two QSFP+ cages accept standard MSA-compliant transceivers or direct-attach cables, so cabling choices depend on the modules you source separately. Buyers needing more than two ports or a different form factor should look elsewhere.

How it compares

Measured against everything we stock in Ethernet Cards & NICs, at today’s prices. Recalculated every night.

Price $160.99
Pricier than about 63% of the 1,505 comparable items (median $90.99).

Specifications

Product
Brand nameC&N
Model nameST7288
Part numberST7288
Performance
Rated speed10 GB/s
Connectivity
Supported standardsEthernet
Ports & slots
Interface typeEthernet
Connection typesEthernet
Bus interfaceEthernet
Size & build
Product weight0.254 kg

Questions about this item

Should I choose the dual-port QSFP+ 40GbE version or a single-port alternative?

The dual-port QSFP+ 40GbE version provides two 40 Gigabit Ethernet ports and supports FDR-14 InfiniBand up to 56Gbps, doubling the connectivity options of a single-port card for server and storage clusters.

What does the 40GbE headline speed mean once the card is installed in a server?

Each of the two QSFP+ ports delivers up to 40Gbps Ethernet throughput with RDMA and RoCE latency as low as 1 microsecond, reducing CPU load in virtualised environments via SR-IOV with up to 127 virtual functions.

Which PCIe standard does the card use and what bandwidth does that cap in practice?

The card uses a PCIe 3.0 x8 host interface, compliant with PCIe 2.0 and 1.1, providing sufficient bandwidth for dual 40GbE ports and 56Gbps InfiniBand FDR-14 operation without host-bus bottlenecks.

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