What is the difference between PCIe 4.0 and 5.0 GPU?
Just the speed of the PCIe bus and how fast the GPU can transfer data over it.
At current there is VERY little in the consumer market that can even take full advantage of PCIe4x16, let alone PCIe5x16.
Where it does help is if you have limited lanes as a x4 PCIe5 provides the same bandwidth as x16 PCIe3 (IIRC).
Also note, just because a GPU can communicate at PCIe5 speeds at x16, doesn’t mean the GPU itself can produce enough data to need to communicate at those speeds.
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Well, that’s more theoretical in nature, though. A 4x PCIe5 slot does not help a lot when you have an existing x16 PCIe3 card.
It works for new cards that take advantage of PCIe5, but these are still pretty rare at least in the homelabber space.
Not at all, it’s provable. Looking Glass is extremely bandwidth intensive so we do a lot of practical testing on different configurations to determine what are cost effective viable configurations for bulk PCIe transfers. Real world testing shows that what would normally require a x16 PCIe3.0 link can be performed on a x8 PCIe4.0 link.
These do exist:
As do these:
I don’t dispute the bandwidth gain of PCIe version 5 over version 4 or version 3.
My point was that an existing PCIe version 3 card will not magically take advantage of the higher bandwidth offered by a PCIe version 4 or version 5 slot.
I make this point because this question came up a couple of times on this forum recently.
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Ah yes, I needed to be a little more explicit here 
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Me, too. Obviously 
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