SpeedFan
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Full user review
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"Something for the power user"
Pros
This application displays computer internal temperatures and fan speeds... What a creation!
The best thing about it is that you can create relationships between fans and sensors, if done correctly, you can create an automatic fan-adjusting system! Even if it does not do it itself!
I have not found any other branded software that does this sort of functionality.
It comes with a handy setup step-by-step guide to get the program running to its maximum potential.
Cons
This program cannot control fans in every motherboard.
The appearance of the control interface is a little boring, a little more 'industrial' themed appearance should cover this.