>  At this moment the room temperature is 31 degrees celsius, the computer
> case is open, the case fan is rotating at full speed (I have a case fan 
> with
> three speed settings), and I have a regular electric fan blowing air 
> directly
> inside the computer at full speed, yet the CPU fan is running at 3900 RPM,
> even though the CPU is completely idle. I wouldn't even dare to try what 
> it
> does in a *normal* situation.
>
>  In none of these situations does the actual CPU temperature exceed 50
> degrees celsius. For example at this very moment it's 44 degrees. Yet the
> CPU fan is going at 3900 RPM. I'm afraid of keeping the PC on for much
> longer because it sounds like it's going to break at any moment.

The fan/BIOS is probably designed to run "silently" at CPU-idle and only 
speed up once it gets loaded.  They are probably doing this by triggering at 


speed trigger temperatures?

Anyway, those temps and fan speeds seem completely normal to me (on my older 
PC the CPU fan runs at 5000 rpm the whole time).  What CPU temp do you get 
at full load?

You can buy a quieter fan if it's just the noise that's a problem.

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