|1) enter the BIOS setup and search for fan control.|
some computers will allow you to fine tune the fan control via BIOS.
2) enter the BIOS setup and make sure that EIST (intel enhanced speedstep) or AMD's powernow / cool'n'quite is set to "enabled".
3) this is true for windows xp:
win xp has some predefinded power profiles / power schemes.
make sure that your are not using "Home/Office Desktop" as it does not utilize adaptive power control.
instead, enable the scheme "Portable/Laptop". this is also true even when you have a desktop / workstation PC, actually!
for additional details see: http://www.bay-wolf.com/speedstep.h...