As the other mate mentioned, you have 3 temperature points, max, medium, min and their respective rpm percentages.
If you have max 70-100%, 50-80% and 30-50% for example, the cpu at 30º will run at 50%. Over 30º and until 50, it will increase to 80%; over 50º the same until 70, when the rpm's will be maxed reaching 100%. I am not sure which specific temperature is used, I would bet it needs all the cores over the checkpoint to reach the selected percentages.
In regards to the failure I mentioned, I saw it used to show up when selecting close percentages, for example 70-100%, 50-90%, 30-80%.
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