Hi I want to buy a 7950 but will it work on my configuration amd a6 3670 quad core 2.7ghz oc to 3.1ghz 750w psu and my tower can hold cards up to 4000mm long and could I play crisis 3 and battlefeild 3 on ultra settings. and ive only got 1 gpu slot I dont know whether or not that makes a difference thankyou