What is the main difference between ConnectX 4 and ConnectX 5Ex?

What is the main difference between ConnectX 4 and ConnectX 5Ex?

My systems require 2x100G QSFP28 ports to support 100GBase-CR4 DAC.

  1. What will be the suitable PCIe card to use? ConnectX 4 or 5Ex?

  2. Can connectx 4 and 5Ex supports 4x25G mode?

Hello Bala,

Thank you for posting your inquiry on the NVIDIA Networking Community.

Both adapters support 100GBase-CR DAC. Please review the supported and tested cables through the following links:

The adapter which will give you the highest performance, that is the ConnectX-5 Ex as it is PCIe 4.0 x16. The ConnectX-4 is only available in PCIe 3.0 x16

The following link will provide the PB for the adapters in question:

Our adapters do not support the feature to split the port into 4x25GbE is this is only available on our switches.

Thank you and regards,

~NVIDIA Networking Technical Support

Thanks for your response. Hope connectX-5 adapter will support the feature or accept 4x25GbE that comes from switch or MAC. I assume within one of 100G port at connect x5 adapter side can operate all 4 RF channels(high speed data) independently or 100G as a whole?

Refer drawing below. Kindly let me know.