CPU makes noise?

hy,
does the cpu of the new pbp's makes noise, or a any sound?
i am very sensitive for noise (dont know the word for this, well, i makes me sad, if f.e. the fan start/runs always and is loud).
i use a pb g4, and its cpu is audible, if it runs at maximun speed - silent, but too loud for me, sound like a harddisc).
what about the fan? is it running a lot of time, f.e. during working in photoshop/indesign?
thank you
claus
pb g4, desktopp g4 Mac OS X (10.4.8)

yes, thank you for your posts. i think, if i should get a mbp thats ok, so i will have no problem with the fan, noise... and if i run strong i make "noise" (breathing), so in a way this is normal.
but if i will get a build-on-a-monday-mbp...

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