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Full user review
"nice program except..."
SpeedFan is a nice program that has many features related to temperature sensing, tweaking, warning, et cetera. It can give some system information concerning heat dissipation. It can even generate a temp chart and support hard drive monitoring (S.M.A.R.T.).
It does not support every system. For example, for my computer, SpeedFan only shows temperture but not fan speed, voltage, etc. Also, its FAQ and support is not useful to someone new to the software.