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Lenovo ConnectX-3 EN dual-port QSFP+ 40GbE network card with metal bracket

Lenovo

Lenovo ConnectX-3 EN Dual-port QSFP+ 40GbE network card

SKU CH-CD8V-8F4D4

Dual-port QSFP+ adapter delivering 40GbE connectivity for high-bandwidth server links

  • Speed40GBase-X
  • FeaturesProduct Type:40Gigabit Ethernet Card
  • Dual-port design doubles 40GbE throughput potential
  • 40GBase-X speed enables high-bandwidth server connectivity
  • QSFP+ interface supports flexible transceiver choices
  • Lenovo engineering ensures enterprise-grade reliability
  • First listed by manufacturer April 10, 2020

Dual-port QSFP+ 40GbE adapter for servers

This Lenovo ConnectX-3 EN card adds two 40GbE ports to a server or workstation. It targets administrators who need high-throughput links for storage clusters, virtualisation hosts or backbone segments. The dual-port layout supports link aggregation or redundant paths in a single PCIe slot.

Sustained 40GBase-X throughput under load

The adapter is rated for 40GBase-X operation, so each port can maintain line-rate traffic across extended transfers. Dual ports share the PCIe bus bandwidth, so total sustained throughput depends on the host slot generation and system topology rather than a single-port burst figure.

Standard PCIe installation with QSFP+ cabling

The card installs in a compatible PCIe slot and uses QSFP+ transceivers or direct-attach cables, which are not included. Common issues arise when the host BIOS does not expose enough PCIe lanes or when the switch port speed is misconfigured, causing the link to train at a lower rate.

Highlights

  • Dual-port design doubles 40GbE throughput potential
  • 40GBase-X speed enables high-bandwidth server connectivity
  • QSFP+ interface supports flexible transceiver choices
  • Lenovo engineering ensures enterprise-grade reliability
  • First listed by manufacturer April 10, 2020

Specifications

BrandLenovo
Speed40GBase-X
FeaturesProduct Type:40Gigabit Ethernet Card

Questions about this item

Does the dual-port QSFP+ 40GbE adapter run hot or loud when handling 40 GbE traffic continuously?

The card is a passive dual-port QSFP+ 40GbE adapter with no onboard fan; heat and noise depend entirely on the host chassis airflow and the transceiver modules installed.

What cabling and transceiver modules do I need to connect the two QSFP+ ports to my 40 GbE switches?

You must supply two QSFP+ transceiver modules — either SR4 for short-reach multimode fibre or LR4 for long-reach single-mode fibre — plus matching MPO or LC patch cables rated for 40 GbE.

Will this 40GBase-X card work in an older PCIe 2.0 server slot without losing the 40 GbE link speed?

The adapter negotiates link speed per port; a PCIe 2.0 x8 slot provides enough bandwidth for dual 40 GbE operation, so the 40GBase-X links will come up at full rate.

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