This thread is filled with misinformation and people blabbering about things they have no experience with.
6GB of VRAM was maxed out even on 3x 30" monitors (13.2MP) in Crysis 3 as I showed before.
With 4K Surround, using NO AA maxed out the VRAM in MOST games - older games of course used less but at 25MP, even those games used well over 4GB of VRAM.
Playing BF4 in Ultra w/ NO AA used 5.9GB of VRAM.
Here's an example:
With any AA at such resolutions, VRAM usage will...