I have one GTX 980 and a 1080p monitor and I was thinking about adding another 980 and getting either a 1440p monitor or 4k monitor. I'm just worried that with some games the 4GB of VRAM wouldn't be enough especially for certain games. Would I be okay playing games at 1440p with 4GB of VRAM? I was thinking about getting a 1440p G-sync monitor.