Solved Why is internal fan running at variable speeds

April 4, 2015 at 14:37:37
Specs: Windows 7
internal fan cycles on higher and lower rpm..took off outer shell and watched the fan cycle at lower then higher speeds. Used my finger to stop the fan and saw that it tried to run at higher speed than before. Blew it off with compressed air and it still wants to run at these variable speeds

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April 4, 2015 at 14:51:00
When the processor is doing a lot of work it gets hotter, so the fan runs quicker to cool it more. When it is idle it generates less heat and the fan will slow down as it doesn't need to be cooled so agressively. When you stop the fan (not a good idea!) the processor overheats, even if it is idling, due to the lack of cooling. Then the fan will spin quicker until the processor has cooled again.

The behaviour that you observe is quite normal.

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April 5, 2015 at 06:32:34
✔ Best Answer
The behavior is normal. That said, if it is doing this and you are not stressing your system very hard then there might be another issue as well. These can be:
Clogged cooling fins
Not enough (or improper) case cooling
Undersized CPU heat sink/fan
Improper installation of CPU heat sink
Just to name the first few I can think of. Please post your complete system specs including all cooling components and fan orientations.

You have to be a little bit crazy to keep you from going insane.

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