GPU in x16 vs x8 vs x4

[Pancakes_Galore]

What GPUs are limited by a PCIE x4 3.0?

 

[clutchc]

They are all limited... if by 'limited' you mean perform poorer. However, no single-GPU cards will saturate the PCIe buss at 8 lanes of bandwidth.
You may want to read this: https://www.pugetsystems.com/labs/articles/Impact-of-PCI-E-Speed-on-Gaming-Performance-518/

 

[iamacow]

Eh well 4x PCIE 3.0 is 8x PCIE 2.0 (bandwidth wise) and if your playing at 4k, than you will lose a few fps vs full 16x. If your gaming at 1080. You won't see a difference.