Here are the specifications of my PSU.
It has 2x +12V rails with ampps combined of 29A.
http://www.hardwaresecrets.com/fullimage.php?image=26466
My recent GPU card is ASUS 9600GT.
http://www.newegg.com/Product/Product.aspx?Item=N82E16814121229
From what I already read it should be enought...