I just bought a boxed Intel P4 2.4a to replace my old P3-667. When I run both my P3 and P4 fans run at 4000 rpm, the P4 fan is much noisier to an extent it sounds like a hairdryer. The only time where the P4 fan is as quiet as the P3 fan is when I set it to 2000 rpm. I mean theres surely something wrong with the P4 fan right? Same rpm, but P4 fan is much more noisier.