4k games, the list??

Solution
Most titles can work with 4K, the exceptions being really old games and some crappy ports of Japanese games that tend to cap the resolution to 1920x1080. Do note that some older titles will have issues with UI scaling, as they weren't really designed to run at that high a resolution, so you might wind up with a tiny UI as a result and unreadable text as a result.

Other than that, you're going to need a fairly high end graphics card. Something in the GTX 970 or R9 390 range at absolute minimum, with those you're looking at low settings and about 30FPS at best. If you want ultra settings and 60 FPS, you pretty much need two 980Tis in SLI to get that with current titles at 4K.
Most titles can work with 4K, the exceptions being really old games and some crappy ports of Japanese games that tend to cap the resolution to 1920x1080. Do note that some older titles will have issues with UI scaling, as they weren't really designed to run at that high a resolution, so you might wind up with a tiny UI as a result and unreadable text as a result.

Other than that, you're going to need a fairly high end graphics card. Something in the GTX 970 or R9 390 range at absolute minimum, with those you're looking at low settings and about 30FPS at best. If you want ultra settings and 60 FPS, you pretty much need two 980Tis in SLI to get that with current titles at 4K.
 
Solution