Are 2x Titan XPs enough to run 4K @ 120Hz? From my experience, I'm not sure (if I remember correctly). Most people cannot run this 8K display even at 60Hz because 2x Titan XPs will barely get 30FPS at that resolution. With 4x Titan XPs however, it's a different story. I too want a high refresh rate 4K display for my 2nd rig - will definitely be getting that Asus 144Hz 4K monitor (hopefully it comes out this year) to replace my RoG Swift display.