I had built a 1.33 ghz athlon Tbird about 2 months ago. I have a MSI kt266pro motherboard as well if that matters. The cpu fan is plugged into an adaptor that is plugged into the power supply directly thus bypassing the switch on the motherboard. I've tried to plug it directly in but notice no difference in the loudness. The loudness is directly related to my CPU fan and nothing else. The Computer is not overclocked and neither is the Geforce 3 inside. I don't remember the make and model of my Cpu fan but it was cheap and I do get what I paid for it I guess. I have 2 fans in the machine which are dead quiet and a Blower fan as well that is dead quiet. What else can I do while preserving the speed of my athlon? I'm guessing nothing as this is a tradeoff to the higher speed. Am I wrong?