Is the 3GB worth it over the regular GTX 660ti 2GB versions? Its like $20 difference. And is the 3GB version comparable to the 7950? Or will it still be inferior because of the 192 limited bus width? I only play on 1 monitor at 1080p 1920x1080 resolution. I have had a 6870 for about 4 years now, and i really wanted my next GPU to be nvidia so i can get a real grasp for both companies.