i'm also interested to replace the fan inside the ST45SF-G. 33 dB (at max) is quite a bit too loud according to my other components.
Because a 80mm fan is inside the psu, maybe the Noctua NF-R8
will fit without limitations? I don't know if the height fits and i can't find something about the pressure on this page. But there's also a PWM edition
available (do i need this edition instead?) where a static pressure of 1.41 mm is mentioned. This is indeed lower as with the included fan.
Or are there some alternatives (the Noiseblocker NB-BlackSilentPro is 120mm, does it really fit?)?
overlooked that, a 80mm BlackSilentPro fan is availableEdited by at0m33 - 11/6/13 at 6:08am