I'm still on PCIe 3.0 on my main machine and the RX580 works fine for my needs. Outside of the scope of OP, I recently picked up a (new) 5060 not due to the impending memory production apocalypse but because I wanted to extend my current setup with something I recently read about on LSFG, previously posted here but garnered no interest/comments.

- https://news.ycombinator.com/item?id=44499245