I'm building a gaming computer and have chosen all my specs now except for the graphics card. I've narrowed my choices down to either the Sapphire Radeon 7970 Ghz Edition or a GTX 770 EVGA ACX SC. I like the PhysX of the Nvidia card, and the 3GB VRAM on the Radeon card. To me, it appears that next gen games are going to be more optimized towards AMD. EA has announced that Battlefield 4 will be optimized for AMD. How much VRAM do games use now on average? Will that increase to over 2GB within 3 years or so? Is PhysX that noticeable in games? I plan to get Arma 3, which is supposed to use PhysX, that was one reason I considered the 770. I realize they trade blows in most games in terms of performance, but which one will be better in the long run? Thanks in advance.