I have an HP, 500GB hard drive, 3GB RAM, AMD Atlon 64 X2 Dual-Core Proccesor 6000+, Windows Vista. My Hp only has a 6000 Series NVIDIA Garphics card. I want to update it to an 88000 SG, but I also have to update the power supply. I'm only going to do this for cames like Tribieum, Spore, and any other future games. Does nayone have any thoughts on this?