Hmmm, maybe my fan is running slow or something, I think it can go as low as 1200rpm or something but I'm also pretty sure it adjusts to compensate for heat build up and might go up to 2500rpm depending on the heat? I'm hoping as otherwise it's not going to help with ocing much will it. At least it's quiet
As for the noise in your case try this: http://www.frozencpu.com/noi-02.html, I'd be intersted to see how much it help