I don't agree with your Ist reply at all. I have seen many reviewers trying 3d in full hd using a single 580 and getting good playable fps in games like crysis 2.
Reviewers never max out their setups. Often you wont get to see the occasional spikes as they show you avg fps.
Crysis 2 shows usage of 1.6-1.8GB. Imagine how much 3D would draw.
Metro 2033 shows 1.2GB use. in 3D easily 1.7GB I'm sure.
GTA IV shows 1.4-1.6GB usage. 3D would obviously require quite a bit more.
Crysis 1 and Warhead also use 1.6GB.
The above are at a resolution of 1680x1050. That is not even FHD/1200p.
I didnt even tweak the drivers.
Reviewers usually only show the average framerates and many do not max out their setups in terms of AA, or they even tweak drivers for better performance over higher quality.
And about 3d being immature, its a complete personal opinion. There are lot others who appreciate the technology.
I know I didnt specify it, but I was referring to active 3D. Shutter glasses hurt your eyes and damage your brain, especially over long periods of use. PERIOD.