I have a Dell XPS 600 series that came with two 7900 GS cards, the card in the second slot has been replaced 4 times, I think the slot is broken etc, point is I got sick of replacing it over and over and hasseling with dill over the phone. I want to buy a single replacement card. My question is this, will EVGA 768-P2-N831-AR GeForce 8800GTX be compatible with my computer?? Is the power supply proprietary and not going to work with any card that dell dosnt supply, will the card fit in the case?? Is my power supply powerful enough to run it?? Thanks in advance