PCIe 4.0 and 3.0

[007mr25]

Hi,

 

Asking for a friend. Would a PCIe 3.0 GPU work on a motherboard with PCIe 4.0? I know the that a PCIe 4.0 GPU works on a motherboard with PCIe 3.0, which limits the speed to what PCIe 3.0 can do.

 

Looking forward to hear from you

Best regards Martin

[jj9987]

3 minutes ago, 007mr25 said:

Hi,

 

Asking for a friend. Would a PCIe 3.0 GPU work on a motherboard with PCIe 4.0? I know the that a PCIe 4.0 GPU works on a motherboard with PCIe 3.0, which limits the speed to what PCIe 3.0 can do.

 

Looking forward to hear from you

Best regards Martin

Yes, it does. PCI Express 4.0 is both forwards- and backwards-compatible.

[Zando_]

PCIe is backwards compatible all the way back to the OG AFAIK. I can run a Radeon VII (pretty recent GPU) on PCIe 3.0 slots, PCIe 2.0 slots, and if I had a PCIe or PCIe 4.0 board I could run it there.

 

The only difference is the speed. PCIe 2.0 x16 would slightly bottleneck my card, PCIe 3.0 x16 won't bottleneck any GPU on the market (not even the 2080 Ti/Titan RTX), and PCIe 4.0 x16 is uselessly overkill for current GPUs. 

[007mr25]

Thanks for your quick response, will tell him right away