I think it will be wise to wait for the 8GB VRAM version, because the VRAM requirements of PC games are rising rapidly as a result of "next gen consoles effect", Watch Dogs needed 3GB, The Evil Within devs say you HAVE to have 4GB of VRAM to run without issues, and now Middle-Earth: Shadow of Mordor requires AT LEAST 6GB(!) of VRAM to run at ultra settings (2GB is now for medium). I predict that VRAM requirements will come to a halt at 8GB because that is the amount on the consoles, and I think the game developers that are not optimizing for PCs are just "mirroring" the data on the RAM and VRAM that is why game that don't look better than Crysis 3 which can be maxed with 2GB VRAM require x2 or x3 more.