I was going to just order the amd one but I started reading about physx and watched some vids and it seemed pretty cool. If the difference in fps is only a few I'll go with the nvidia. But if it's somewhere around 9 or more I'll go with the amd.
I have an i5-3570. 8 gb of ram. And a 650 watt psu. I want to play stuff like Skyrim, fallouts, starcraft, End of Nations, and Elder Scrolls Online.
I you can suggest a better card for around the same price I'm willing to get a card other than these two.