Well, it's (virtually) impossible for the CPU to make such a noise. Most likely the noise is from a vibrating component (usually an inductor or transformer) in the POWER SUPPLY circuit on your motherboard near the CPU. OFten you'll get one of these with a loose winding or that is poorly mounted to the board and it will vibrate under certain conditions and make this (often annoying) noise.
Why does it only do it when you overclock? Well, as you overclock you cause the CPU to pull power power from the supply. I'm guessing that only when the power level rises above a certain threshold does the vibration start.
There is little you can do to fix this yourself since the parts are very small and you need special tools to fix them. Since it's new, I suggest returning it for an exchange.
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by: meehangePosted on 2003-07-08 at 19:09:54ID: 8881913
Weird, have you tried opening the case to localize the sound source?
The only guesses I can make are expansion of some component due to heating causing some moving parts to make the noise or perhaps one of the fans speeds up to compensate?
If you can localize the source it will probably be apparent.
Cheers,
Gerry.