Is a Corsair Builder 500W http://www.newegg.com/Product/Product.aspx?Item=N82E16817139050&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&AID=10446076&PID=3938566&SID= enough to power a GTX 480? I have the opportunity to buy the 480 used for $150 and I want to make sure I can power it.