yeah, i gotta admit it is a bit quieter, but without the second fan, my cpu temp is about 5 degrees higher.  and you're not getting the extra 55 watts the 330 gives you.  IMHO, stick with a good enermax.  If noise is a concern, you're better off using the best supply and sticking your comp in a closet or better yet another enclosure like a cardboard box.  No joke, i use one and love it.  I mostly do harddisk recording and editing so it's a godsend.  good luck.