I see DSR factors. It lists from 1.20 native resolution up to 4.0. What should I use? I'm running a 1920x1200 monitor and that's what I run WoW in.
Depends what resolution you want to downscale from. I use 1.5x @ 1080p (which gives an odd resolution of like 1516p or something) and with a small amount of AA on it looks good to me but IQ is one of those things that is so subjective.