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KevinDS95
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PCie Gen4 and 25Gbit/s network card

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

 x1x2x4x8x16
PCIe Gen 3 bandwidth1 GB/s2 GB/s4 GB/s8 GB/s16 GB/s
PCIe Gen 4 bandwidth2 GB/s4 GB/s8 GB/s16 GB/s32 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...

 

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Sreec
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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.

 

Cheers,
Sree | VCIX-5X| VCAP-5X| VExpert 6x|Cisco Certified Specialist
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Sreec
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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.

 

Cheers,
Sree | VCIX-5X| VCAP-5X| VExpert 6x|Cisco Certified Specialist
Please KUDO helpful posts and mark the thread as solved if answered
KevinDS95
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Ok thank you
I didn't know the bandwidth was "per lane".

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bustmove-ls
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25Gb=3.125GB

notice the different between B(yte) and b(it).

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