My power supply is a CORSAIR 450W power supply with 33 amps on the 12v rail. Should be enough for a 8800 gt right? System is pretty old using a AMD x2 4400 with pretty much standard other devices so its not a huge power hog.
Actual model is http://www.newegg.com/Product/Product.aspx?Item=N82E16817139003
Actual model is http://www.newegg.com/Product/Product.aspx?Item=N82E16817139003