you might find it hard to find a monitor which can accept a 4k resolution input from your graphics card, when the native resolution of the screen is lower (e.g. 1920 x 1080). Some of the Korean models now talk about "virtual 4k" support which does allow that, on to a 2560 x 1440 res screen. however, imo it's pretty pointless as the image quality is not very good, there's a lot of blurring and the image isn't sharp. I don't see the point in doing that for games or anything as you're just placing a larger demand on your graphics card anyway. If you were outputting 4k to a 4k res screen then the image quality is sharp and crisp as it should be