I was going to go with a 295 but the price jump from 260 to 295 is pretty crazy, is the performance increase really worth it? I'm also not 100% sure if my PCI-e slot is 2.0 or 1.0, I think it's 2.0 but is there any way to find out a definite answer?
I also wasn't sure if a 650w PSU would be sufficient to run a GTX 295, I know almost nothing about that kind of stuff.
One last thing, my motherboard supports Socket AM3, so would I be able to swap the processor out for this without changing anything else in my system? http://www.newegg.com/Product/Product.aspx?Item=N82E16819103849