I use the SLK-800 on an AMD 2200. I am using the 80 mm HO Delta Fan 4900rpm 68.5CFM. I have a voltage regulator on the fan and have it dialed down to 3200 rpm. Full load for 1/2 hour and I am at 38C! Can't remember what I HAD overclocked this thing to at one point, but at 3800 rpm I still never exceed 38C at full load. (at 3200 rpm I really can't hear the delta).
Simply, the SLK-800 is the best cpu cooler I have ever owned, and one of the few pieces that it I had to buy again, I would. I thought about buying one of the silent fans and suspect that things would remain unchanged - but since I can dial down the Delta, why bother. But I would not hesitate to say that you could throw any 80 mm fan on it - actually the SLK accomodates 60 - 70 -80 mm fans.