I have a 3090ti. Made the switch to Linux last year after reading that most games work. Never had a problem with the card, it works flawlessly out of the box (using the proprietary Nvidia drivers).

It still was a bit of a learning curve for me though… Using steam they work without a hitch. If they are not on steam, I found that the easiest (for me) is to install them using lutris, and then adding them to steam as non-steam games and using Proton to run them.

I don’t play that many games though, so ymmv