I run 3 monitors with my 2060 ultra XC, so not a 2060 super or anything like that. all 1080p, one is 144hz the other two are 60hz, and I only game on one of course, but I have very little issues at 1080p usually high to ultra settings, with RTX disabled, but if I enable RTX I usually have to bump other settings down to medium to low to compensate for the loss of fps. I imagine you probably could run 4k at mid/high settings but I wouldn't want to go over 1080p.