My friend will give me one of these two PSU. Which is the better? Which one should I take? The corsair is 450w with 33amp on the single 12v rail while the antec is 650w with 3 12v rails. It's gonna power a gtx 260 or hd 4870. SLI is a possibility in the near future. The PSU will sit in an antec solo case.
CORSAIR CMPSU-450VX 450W
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139003
Antec NeoPower 650 650W
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371011
CORSAIR CMPSU-450VX 450W
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139003
Antec NeoPower 650 650W
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371011