ok guys i dont know what to do ... some people say 2Gb sli is enough to play games on highest quality with good AA lika MSAA or SMAA for the next 3-4 years (1080p)
but i saw this http://www.guru3d.com/articles_pages/crysis_3_graphics_performance_review_benchmark,8.html
and crysis 3 is already using 1933 vram on 1080p with 4 MSAA ! so i'm sure the next crysis will need much more than 2gb don't you agree ?
what should i do ?
4GB..This way if you wanna up the resolution or if games wanna eat more then 2GB of ram you will be set and 2 770s in sli is a VERY good option as well pretty much out pointing the 690/7990 so yea performance wise you will be fine