I'm in the middle of trying to build a new computer. I found on google that the RX 7900 XT is spose to be PCIe 5.0 I'm trying to verify this as ive got integrated video with the setup and im hoping that will last until a PCIe 5 card comes out.
Your question doesn't make any sense. There are no pcie 5 GPUs released yet. 7900 series is pcie 4. And pcie is back compatible. You can put a pcie 4 card into a pcie 3 slot for example, and it will still work.
