Hi spixel: I admit I am still left a little confused. You state the RPM doesn't increase after 50%, but the medium and high temperatures differ... I'm not sure what's up there, when mine remained the same. The fanmate I have doesn't state low/medium/high; it's just a dial with the word "up" and an arrow showing which way to turn it. I judged the 50% mark based on how much I had to turn it from its lowest setting to its highest. For what it's worth, I'm still using the cooler in the same PC it was tested in. Sitting idle at 35C at the moment... not too bad given the rather high ambient temp in here. /me kicks his A/C.