I have to ask, because im not that good with computers, only know how to play the games, but what graphics card is better, a GeForce 8600 GT or a VisionTek - ATI Radeon HD 4870 1GB Graphics Card??
^What they said. You need a quality 500W PSU for the 4870. If your PSU is weak and you cannot replace it, a 4670 is still a lot better than an 8600GT, but doesn't use much power at all.