I have 2x5770s in Crossfire; Recently I purchased a 47" 3D TV, and would like to try out gaming in 3D. My question is, is it worthwhile to upgrade from 2x5770s to a 6870 or 6970 or even a Geforce 570? I run an ATI mobo so ATI would be choice.
If you want to do 3D gaming you will need to go with nVidia, as ATI doesnt do it well yet.
AMD has a 3D option with passive glasses, but you are limited to a very few supported monitors (like 2 or 3), and you need to get the hardware from various non-AMD vendors. I have not read any reviews of this new implementation of passive 3D.
I have tried 3D Vision on an Nvidia setup, and it was mind-blowing. If you are serious, it would be easier to go with a single GTX 570 with the 3D Vision kit, which includes active shutter glasses that are synced to the monitor. You would still need to research whether your current TV is compatible. Having an AMD motherboard will not limit you to AMD video cards.