SpeedFan

SpeedFan monitors fan speeds, temperatures, and voltages in computers with hardware monitor chips. It can access S.M.A.R.T. info for those hard disks that support this feature and show hard disk temperatures too, if supported. It can even change the FSB (Front Side Bus) on some hardware. At the lowest level, it's a hardware monitor software, but its main feature is that it can control fan speeds according to the temperatures inside your PC, thus reducing noise and power consumption.

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1.25MB 

Windows 2000/XP 

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Freeware