SpeedFan is a program that monitors voltages, fan speeds and
temperatures in computers with hardware monitor chips. SpeedFan can
even access S.M.A.R.T. info and show hard disk temperatures.
SpeedFan supports SCSI disks too. SpeedFan can even change the FSB
on some hardware (but this should be considered a bonus feature).
SpeedFan can access digital temperature sensors and can change fan
speeds accordingly, thus reducing noise. SpeedFan can find almost
any hardware monitor chip connected to the 2-wire SMBus (System
Management Bus (trademark belonging to SMIF, Inc.), a subset of the
I2C protocol) and works fine with Windows 9x, ME, NT, 2000, 2003,
XP and Windows Vista. It works with Windows 64 bit too.

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