My coolfan is setting different speed all by it self and it sounds very annoying. My MB is Asus p4t533-c and my cooler the retail from Intel. I got to powerplugs in the MB but there is 3(ez plug), are they all neccesasy? How do I stop the cooler from speeding up? It does that when it works harder. It is not my power supply(chieftec Scorpio 340w) bcause it did not do it with my last cpu. I cannot change anything in the bios perhaps it may be a jumper. I think it is Qfan but is that not optional?