SpeedFan
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Full user review
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"Excellent idea but needs more development."
Pros
Shows CPU temp in system tray.
Shows smart info of disks.
Usually uses only 1.5 MB of memory but peak is 18 MB.Cons
They claim its main feature is to vary the fan speed. But on my machine the revs are almost constant. This may be due to the motherboard I have, but they could not answer the problem.