PCIe Lanes Limitations
Discussions center on the number of PCIe lanes provided by CPUs, their bandwidth capacities across versions like PCIe 3.0/4.0/5.0, and whether they create bottlenecks for GPUs, NVMe drives, NICs, and other peripherals, with comparisons between AMD and Intel processors.
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PCIe lanes usually. CPUs only give you so many.
PCIe bandwidth is not typically a bottleneck, it has kept ahead of what people need. 8 lanes of PCIe is already 16 GB/s
I don't think it has more PCIe lanes -- those are limited by the IO die, afaik.
Wouldn't you suffer from lower bandwidth than over PCIe, though?
Usually you don't need x16 lanes for each GPU. x8 or even x4 in PCIe 3.0 will be enough but there is no way to know without checking.
the problem is PCIe speeds are increasing faster than network. pcie5 can hit 500Gbps in theory, but the network is only 400Gbps.
How much PCIe bandwidth do you need to avoid it being the bottleneck?
There's plenty of bandwidth despite the limited number of lanes; I'd think with a PCIe switch everything would be just fine...
Go for an AMD chip, you get 60-128 general purpose Pcie lanes.
64 instead of 24 pcie lanes is huge too