All,
There are several things in a computer which will have their operational
parameters vary with CPU activity. The most likely ones are: audio
subsystem receiving noise coupled either directly (magnetically) into its
signal lines or via its power feed; or the load on the power regulation unit
itself. Yes, coils do can make a buzzing sound. The name of the phenomina
is 'magnetorestrictance' (who wants to be I spelled that one wrong?) which
is the property of a material to change its physical dimensions under
varying magnetic fields--it's the reason large power transformers 'hum' and
how most high power sonar units generate their signals.
If I remember correctly, this is an IFAQ, but could go in the FAQ so that
the-word-which-will-go-unmentioned can get spelled correctly once and for
all.
Cheers,
David
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