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 hards disks that support this feature (almost all :-)) and show hard disk temperatures too, if supported. 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. Most Winbond sensors and ASUS AS99127F support fan speed changing, as well as others from MYSON, ANALOG DEVICES, NATIONAL SEMICONDUCTORS and ITE, but the motherboard should make use of available pins.

This program is aimed at the power user. To the one who knows what he's doing. I've heard of no real problem caused by SpeedFan, but may be it's due to the fact that once it made the PC explode and the user disappeared in the blast, thus being unable to report :-)
Anyway: SpeedFan can be extremely useful, but you should first watch its behaviour before setting and forgetting it.

Use this software at your own risk :-)

If you use SpeedFan to create an application or a tool that relies on SpeedFan's functionalities, you must contact the author to find an agreement. Basically, you can't earn money on top of SpeedFan's functionalities.

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