Hi!
Im just testing my brand new Seasonic M12 600W on my old AMd (+4400)system while waiting for my 6600 cpu to arrive (monday).Id say its just as silent as the S12 600W and the small 60mm fan while operating is perfectly silent and it dont start until the PSU is hot enough.Some pics:
http://img143.imageshack.us/img143/9...0013mh7.th.jpg
http://img235.imageshack.us/img235/3...itedbx0.th.jpg
http://img84.imageshack.us/img84/896...blarya0.th.jpg