> and step the fan into (for instance) one of three variable speeds. > http://www.newegg.com/app/Showimage.asp?image=35-106-017-01.JPG/35-106-017-02.JPG/35-106-017-03.JPG/35-106-017-05.JPG that fan supports speeds via a temp probe that goes between the cpu and the fan base itself.