Do you have links to some data that says VRAM use is over 2GB in Surround, barring isolated examples like "game X with texture pack Y at 8X MSAA". Point there being I can probably find settings where 3GB are exceeded, or 4GB for that matter.
I've done a lot of surround gaming at 57X10 and 60X10 (most common res for surround, 1080PX3) with 1.5GB, 2GB, and 3GB. For the most part, 1.5GB works at 4X MSAA. I don't think I've ever seen problems at 2GB or 3GB.
Not to mention for all of 2011 pretty much everyone and their brother was saying "2GB is the thing to have for surround/eyefinity".
If 680 ends up at 2GB, that won't be a factor in my buying decisions.



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