I was thinking of upgrading my video card (gf3 ti500) to a geforce fx 5900, but the minimum power supply requirement is a 300W power supply. I have a Dell 8200 p4 2ghz cpu with a 250W power supply. So, I was thinking of upgrading my power supply to 350W. Can you fit in any power supply or does it have to be compatible with your motherboard? Is there any requirements for the power supply? Thanks.