I can tell you that I'm struggling to get games to run at 60fps on my 4K TV and since the 2080 isn't better than a 1080Ti, I think you'll share my problem. Of course it depends on the game and how much detail you're willing to sacrifice but just running any game at 4K Ultra isn't realistic if the target is 60fps. So far I've done pretty well with games like FFXV and Monster Hunter World but SotTR is the final boss that proved impossible to beat. So a step down to my monitor (3440x1440) apparently should do the trick (mind you I don't own the game). Also this talk about DLSS is somewhat skewed since the tech itself won't magically add frames on it's own. All it will do is help performance compared to other enabled AA techniques and personally, AA is the first thing I turn off when I cannot reach 60fps in 4K so DLSS would not have helped me at all in those scenarios.