Before you celebrate finding a PCI-E slot and rush out and buy a 8800GT, you'll want to check your power supply. You'll need a good quality 400 Watt PSU ( or quite a bit higher if it's not a good brand ) to run a 8800G
This has been bugging me the past week. When a video card states the wattage requirement, does it mean that with your typical computer components as well, or a dedicated 400 watts?