Mac Pro 2010 and Lion: buzzing noise from CPU board when idle

Hi all,
I have a 2010 Mac Pro with the 3.2 GHz quad core. I recently installed Lion and now whenever the CPU load falls below a certain threshold (approx. 10-20%) something on the CPU board starts to make a buzzing noise. It sounds like a capacitor or coil. Sometimes it is nearly impossible to hear but most of the time it is quite annoying.
Removing the CPU board and putting it back in, solved it yesterday. But after waking up the system this morning, the buzz was back again.
Also, this does not happen when running Snow Leopard or Windows in Bootcamp.
Does anyone experience the same issue?
Best,
b.lam

Then I would do a clean Lion install. Hopefully you saved the installer DMG.
How to create an OS X Lion installation disc MacFixIt
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