What is the fan utilisation on the X40?

[KenFodder]

I was wondering does the fan on the X40 constantly spin/variable speeds or are there periods when it doens't spin at all when idle?

I used to like my dell as the fan was hardly used only when the cpu heated up and needed to remove the heat it started to spin or spin variably as needed, whereas my work laptop a Toshiba Tecra the fan constantly spins and if idle still remains spinning at a low speed!

Thanks guys.