PCie Gen4 and 25Gbit/s network card

[KevinDS95]

Hi everyone,

I don't find any specific response to my question but I will ask you anyway.

Does someone know how is it possible to have a 25Gbit/s network card PCIe Gen4 connected to a PCIe 8x port and have a 25Gbit/s speed rate ? If I'm not wrong, the 8x mode of PCIe Gen4 can go up to 16Gbit/s only but the network card can go up to 25Gbit/s.

https://www.kingston.com/en/blog/pc-performance/pcie-gen-4-explained

	x1	x2	x4	x8	x16
PCIe Gen 3 bandwidth	1 GB/s	2 GB/s	4 GB/s	8 GB/s	16 GB/s
PCIe Gen 4 bandwidth	2 GB/s	4 GB/s	8 GB/s	16 GB/s	32 GB/s

Intel E810-XXV 25Gbit/s network card:

https://www.intel.com/content/www/us/en/products/sku/189760/intel-ethernet-network-adapter-e810xxvda...

[Sreec · Accepted solution]

How it's possible to have a 25Gbit/s network card PCIe Gen4 connected to PCIe 8x port and have a 25Gbit/s speed rate https://www.intel.com/content/www/us/en/products/sku/189760/intel-ethernet-network-adapter-e810xxvda...

Throughput per lane is 16 GT/s, and as we have a full duplex, we will get 32 GT/s per lane so eventually bandwidth will be more based on the number of lanes Pci Gen4 supports.

[KevinDS95]

Ok thank you
I didn't know the bandwidth was "per lane".