Hey, I'm new to PCs and I recently got a gaming PC. My screen resolution is 1920x1200, and when I was playing Mafia 3, I noticed that I could change the resolution from 1920x1200 to 3640 or something like that even tho my max resolution is 1920x1200. The image on 3640 is a lot clearer, but my gameplay drops to about 10fps, whereas I used to get a smooth 55-60 on high graphics. Also on 3640 the map and everything is smaller. The first image is on 1920x1200.
the next image is on 3640