SpeedFan is a freeware program that monitors fan speeds, temperatures and voltages in computers with hardware monitor chips. SpeedFan can even access S.M.A.R.T. info for those hard disks that support this feature and show hard disk temperatures too, if supported. SpeedFan supports EIDE, SATA and SCSI drives. SpeedFan can even change the FSB on some motherboards (but this should be considered a bonus feature). At the lowest level, SpeedFan is an hardware monitor software, but its main feature is that it can control fan speeds (depending on the capabilities of your sensor chip and your hardware) according to the temperatures inside your pc, thus reducing noise and power consumption.

Note: In order to run this beta, simply install SpeedFan 4.31, then replace the EXE from version 4.28 and then run SpeedFan as usual.


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Source: MSFN