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The AOpen board can dynamically adjust the CPU's fan based on the processor's heat level. When the processor runs cool enough, the fan is shut off completely. Through the BIOS, users can set a threshold value at which the fan should spin up, choosing from temperatures between 30° C and 70°C. We set threshold to 60°C for our Pentium M running at 2.13 GHz. (As a side note, Intel's specifications say that a Pentium M can survive constant operation at temperatures as high as 90°C without being damaged.)
With our settings, the CPU fan was always off during normal Windows use. In fact, the processor never got any warmer than 43°C. Watching a DVD resulted in a system load of about 25%, but even this only increased the temperature by one degree.