anyone is good, but the X2 will be better when you start stress testing it. no voltage fluctuations at all. if your still kind of confused visit this thread
http://forums.anandtech.com/messageview.aspx?catid=27&threadid=1815673&enterthread=y
should teach you anything your wondering on psu's
http://forums.anandtech.com/messageview.aspx?catid=27&threadid=1815673&enterthread=y
should teach you anything your wondering on psu's