You could test if it's a bottleneck by increasing the internal resolution a bit. For example if you increase the scale to 150% (DLSS off) and then turn DLSS on, you might see a difference.
Still it's safe to say that you'd bottleneck anyway as we're talking multiplei times the relative power between the components. Don't get me wrong, for HD Gaming your CPU is fine, but it will just not keep up with your GPU. That's impossible!
But at least you should get different frame rates across both CPU's so that is probably not it.
There is a possibility that the games you tested have DLSS solutions that cannot scale below Full-HD, but that's just a guess. Although I think I remember that you could scale Controls DLSS down to absurdly low resolutions.
if you find nothing on the hardware side, look on the software side, it might very well be a panel controller issue.
If it were just Cyberpunk there would have been the possibility that it's just a bug. I once had a bug where my FPS would flip between 60 and 65 constantly with extremely unstable frame times, making the game basically unplayable. I had to uncheck all sync options once, get out of the game, relaunch it and then enable the sync options again to fix it.