bro won't you be wasting your money and time by retesting the fans spcr did already ?
http://www.silentpcreview.com/article739-page1.html

SilenX has just 2 120mm fans right ?
11dBA iXtrema Fan
14dBA iXtrema Fan

Adda fans ? those now in your seasonic PSU ? haha i don't know if they are rare i'm on the other side of the world.