oooookkkk do I have one? if so how do I find out, I know I got a slot in there not being used....i know its pci something....its probably what you are talking about, but im not for sure. I did jsut find this on craigs list:
2 X Nvidia EVGA 7950 GT OK 512mb PCI-E almost brand new 7900 series
its local...cheap....and two of them in my price range...will these work in my system?