Spoilers: 30-45 FPS fore pretty much everything, so not worth playing on 4k. Looks like 2070 MAY be the hope for 4k60 stable, but I'm skeptical. 2080 and 1080ti going to be 4k60+ kings for now.
2060 may be great for QHD or UW QHD, which might put it in a really nice segment of lower cost, but quality systems.