So messing around a little with one 980:
Skyrim with Bethesda HD texture packs at 4k DSR and ultra settings in outdoor environment = 2800 mb, solid 60fps.
Tomb Raider 4k at 4x SSAA and ultra settings including TressFX in outdoor environment = 3500 mb, utterly horrible framerate, around maybe 15 fps minimum. But still, is anyone running a playable 4k with 4x+ MSAA or SSAA as of yet?
Lol, 1080p 6gb? I realize downsampling isn't displaying these resolutions at native but the performance impact is the same as displaying ultra HD in native, and more of an impact than supersampling at it. Also, please don't interpret my posts as hostility towards OP but a rejection of an inefficient use of resources that affects the people who buy these products, both games and PC tech. From the way some of the discussions have been going, some people would easily and uncritically accept 6gb vram as being a new standard for ultra and 1080p at that, supersampling or not. It'd be kinda like Sony making a PS5 next year, nobody wants that, not even Sony.