SpeedFan is a freeware program that monitors fan speeds, temperatures and voltages in computers with hardware monitoring 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 can even change the FSB on some motherboards.

At the lowest level, SpeedFan is an hardware monitoring software, but its main feature is that it can control the speed of the fans (depending on your sensor chip) according to the temperatures inside your pc, thus reducing noise and power consumption.

SpeedFan works fine with Win9x, WinME, WinNT, Win2k, Win2K3 and WinXP.
SpeedFan can be minimized to the tray and is compatible with Motherboard Monitor 5.

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Source : TechZonez