I have a GTX 960 4GB. And I am planing to purchase a 4K monitor (dell P2715q). I know that 960 is not capable of running games smooth on 4K resolution, yet is capable in 1080p. I am wondering about the differences between gaming 1080p on a 4K monitor and 1080p on a 1080p monitor. (Both are 27 inches.) Thanks.