I just got a Galaxy 120mm (with 4 leds) fan to use as my new cpu fan. My question is that it is suppost to be rated at 2400rpm but sensors tell me it's running at anywhere from 1917 - 1982 and I have used it both with the 3 and 4 pin connector. is this normal in terms of a fan of this quality with led's and stuff to not make rated speed? I am just wondering even so it moves a hell of a lot more air then my old led 80mm. thanks