I’m currently dual booting Pop OS and Fedora KDE edition with a 3080, so essentially using both an old GNOME version (Pop) and Plasma 6 (Fedora). Pop works straight out of the box if you choose the Nvidia install and the Nvidia controls are fairly similar to Windows.
Fedora gave me some problems getting it going, but once I’d opted in to proprietary drivers, and did a few updates, it’s been all good. The HDR implementation in Plasma is way better than Win 10 and the only issue with VRR is that it won’t work if you have a multi-monitor setup. Turning off the other monitors works fine. The gpu controls are more limited though.
GNOME is a bit behind Plasma. VRR is an experimental feature and HDR doesn’t run on Nvidia cards. Both should be fixed sometime this year I believe.
If you undervolt your card you are out of luck. There are some limited overclocking tools but underclocking seems like a bit of a nightmare.
Huh TIL. Sorry if I sounded dismissive of GNOME, I was just going by what has and hasn’t been implemented. I actually hated how Plasma looked and how it was set out so ended up getting a global Mac OS theme to fix it.
Part of the reason for dual booting is to figure out which DE I prefer having only just moved over from windows.