Question: I'm using INTEL Prescott CPU on ASRock motherboard. After the system works for a while, I realize that the sound of the CPU fan is getting louder. What's wrong?(2004/5/15) Answer: Please understand that this is a normal behavior of Intel boxed heat sink. The cooling fan which comes with Prescott CPU (see the following pictures) is an automatically adjustable CPU cooling fan and the speed of the fan will be adjusted according to the environment temperature. While higher temperature is detected by the INTEL boxed heat sink, the fan will speed up. So the sound will get louder.