http://www.geforce.com/whats-new/articles/the-witcher-3-wild-hunt-is-your-system-ready
1920x1080, Low settings GTX 960
1920x1080, Medium settings GTX 960
1920x1080, High settings GTX 960
1920x1080, Uber settings GTX 970
1920x1080, Uber settings w/ GameWorks GTX 980
2560x1440, Uber settings GTX 980
2560x1440, Uber settings w/ GameWorks GTX TITAN X, or 2-Way SLI GTX 970
3840x2160, Uber settings GTX TITAN X, or 2-Way SLI GTX 980
3840x2160, Uber settings w/ GameWorks 2-Way SLI GTX 980 or GTX TITAN X