Well, depends on the game type also. I don't mind playing Tomb raider 35-50FPS. But shooters and racing game have to be 60-144fps. By the way SSAA(Super Sampling AA)=DSR(same thing but branded Nvidia, and more resolution available). At 1080p 2xSSAA equals DSR at 4K. So indeed, if you go for 4K, 2xSSAA, 4K DSR you'll need the best GPU out there.