On the subject of VRR flicker, I'm noticing it a hell of lot more since moving to a 5080 from a 6800 XT despite the substantial improvement in framerates, even after this past weekend upgrading to a 9800X3D from a 5800X3D, and it seems to be caused by microstutter or something like it.
Despite the lower framerate on the AMD card I just didn't get it apart from on loading screens/hitches due to shader caching so something funky might be going on with the Nvidia drivers, or other apps I have running alongside it. This with a change in motherboard manufacturer (Gigabyte to Asus) and clean Windows 11 install.
Granted, it's mainly in Darktide which is pretty janky, but it was fine before (even though I was using FSR3 FG). There are a bunch of troubleshooting steps for that game I haven't yet tried, but it's annoying. I do note that when I tried the 5080 in my mates 7800X3D system these stutters weren't present, but he has a AW3423DW compared to my MAG 341CQP (same panel but Freesync only). Other games are generally buttery smooth and lovely (although I have to use mouse smoothing in Helldivers 2 otherwise it feels like it's running at 60Hz, a common problem apparently, but again not one I encountered on AMD. With a controller it's smooth).