Buzzing noise from my T400s is, very annoying. I am not saying the fan noise, but at a strange sounds! After careful testing, I decided the noise level seems to be directly proportional to CPU speed. I use Windows 7 and the ThinkVantage Power Management. I switch to advanced mode to power plan and System Settings; one can choose the following four largest CPU speeds Max, adaptability, low and lowest. Switch to the maximum, hit Apply give me an annoying level of sound that is noisy obvious. But I need to know the answer why I am getting noise from Lenovo T400.
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