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PCIe 4 x16 vs PCIe 4 x8: any noticeable difference?

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Hi all, as per thread title: what’s the practical difference I might see running a 3xxx GPU on a 4th gen PCIe slot at x16 speed, vs running it at x8 speed? Thanks! :)
 
Ok thanks mate that’s very useful. The reason for asking is that I’m about to run an ASUS Strix z590-e motherboard with Intel 11900k, and this motherboard has two gen 4 PCIe slots for NVMe, but, if I use both slots then I can’t run the GPU at PCIe 4 x16 speed, it’ll have to be reduced to x8 as it apparently shares bandwidth with the second NVMe.

Which is a bit odd, unless of course ASUS were not worried about the hit to the GPU performance, which from the article would appear to be negligible. Cheers :)
 
Ok thanks mate that’s very useful. The reason for asking is that I’m about to run an ASUS Strix z590-e motherboard with Intel 11900k, and this motherboard has two gen 4 PCIe slots for NVMe, but, if I use both slots then I can’t run the GPU at PCIe 4 x16 speed, it’ll have to be reduced to x8 as it apparently shares bandwidth with the second NVMe.

Which is a bit odd, unless of course ASUS were not worried about the hit to the GPU performance, which from the article would appear to be negligible. Cheers :)

It is annoying when they share bandwidth with the main GPU slot , luckily on my MB which is an Asus Maximus Formula XII it leave the GPU slots alone and shares its bandwidth with the other 2 pcie slots which are not normally used as much.

just had a look at the specs of gen 4 x8 and basically will be identical to running it in PCIE 3.0 x16 as both are 16GB/s so not problem what so ever on a 3000 series card :)

https://www.trentonsystems.com/blog/pcie-gen4-vs-gen3-slots-speeds
 
Which is a bit odd, unless of course ASUS were not worried about the hit to the GPU performance, which from the article would appear to be negligible. Cheers :)
If you want PCIe v4 for everything, you need Ryzen and X570 board.
Even after two years Intel simply doesn't have PCIe v4 chipset.
 
Hi all, as per thread title: what’s the practical difference I might see running a 3xxx GPU on a 4th gen PCIe slot at x16 speed, vs running it at x8 speed? Thanks! :)


It makes zero difference, margin of error basically when testing. I have a pair of 3090s in SLI/NVLINK and I see no real world difference when set to pcie 4 x8 on both cards on a x570 and 5950x,both 3090s can hit 100% use at the same time for my work and same applies to games that can use them both.

Build here and most specs in the signature and some on the link below that have not been updated yet.

https://forums.overclockers.co.uk/posts/34846430/
 
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