3440 x 1440 uses more vram then a standard 1440p. Plus you never know what the new games are gonna use. I have a Dell 34 ultrawide and 2 GTX 980's in SLI and I hit the Vram limit in a couple of games already. I even hit it in Battlefield 4 a couple of times. I have already ordered 2 titan x's from nvidias website. Once they arrive I will be selling my 980's. I plan on gaming at 3440 x 1440 for a while. Hopefully the Acer 144hz comes out soon. To hit that high of FPS, 2 titan x's will be needed for most modern games at ultra settings.