Help with upgrading

I would go with the 680 as driver support is much better. IF you decide you want a 7970 instead, then get the XFX as Gigabyte's CS is terrible.

GHz edition is simply an AMD card clocked over 1GHz stock.
 
I was thinking the 680 too, just because physx is easier to do with nvidia since the gpu will handle it, instead of my cpu.
 
PhysX has nothing to do with CAD. It's a physics processing API designed specifically for fluid motion of things such as flags and bodies and to be ran on Nvidia cards. It is great if implemented right, but most games that use it don't seem to put too much time into it or only use it for cloth items.
 
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