i just thought this through building my new PC and house. The bottleneck is always the NIC because the most you can do right now is like 10gbe for conventional motherboards.
After that you also run into cabeling issues. Cat 8 for instance also only does 40gbe max, which means for any more you need to bundle up connections which comes with its own problems.
Another point is that while mining, gpus still are independent and not connected to each other. so each of them are restricted to the max your PCIe port will give you too.
PCIe 4.0 has a maximum data transfer rate of 16 GT/s (gigatransfers per second) per lane, which translates to 2 GB/s (gigabytes per second) per lane. PCIe 4.0 can support up to 16 lanes, which means that it can provide a maximum data transfer rate of 32 GB/s (gigabytes per second) in each direction (upstream and downstream) on a x16 slot.
After that you also run into cabeling issues. Cat 8 for instance also only does 40gbe max, which means for any more you need to bundle up connections which comes with its own problems.
Another point is that while mining, gpus still are independent and not connected to each other. so each of them are restricted to the max your PCIe port will give you too.
PCIe 4.0 has a maximum data transfer rate of 16 GT/s (gigatransfers per second) per lane, which translates to 2 GB/s (gigabytes per second) per lane. PCIe 4.0 can support up to 16 lanes, which means that it can provide a maximum data transfer rate of 32 GB/s (gigabytes per second) in each direction (upstream and downstream) on a x16 slot.