Just a guess but the power regulators onboard the motherboard are a switch
mode style and I suspect what you are hearing are the wire wound inductor
cores whining when they are being loaded up by the cpu. Overclocking would
probably make the noise worse as the cpu would load the power supply even
more.
Gp
"Matt K" <nobody DeleteThis @nothing.com> wrote in message
news:tbScndANo9HqRI2iXTWJhw@veiinternet.net...
> I bought a used AX6BC motherboard and it's making a high-pitched noise.
The
> noise seems to be coming from behind the CPU or possibly right in front of
> it. It happens whether I have a Celeron 500 or a 600 overclocked to 900
in
> it. The noise is different depending on which cpu is in it and what it's
> doing. Neither CPU creates a noise when it's idle. The C500 has a sort
of
> pulsing noise when running Prime95 and a more steady tone when doing other
> stuff. The C600@900 makes no noise when running Prime95 but makes a
steady
> tone just like the 500 when doing other stuff. It's not a coppermine
> approved lot and I was wondering if it might have been damaged from
running
> a Celeron 600@900 in it. I've never heard of a motherboard making noises
> before.
>
> I have a couple of wav's of the noise but I don't know what the policy on
> posting binaries is for this group. If someone tells me whether it's ok
or
> not I'll post them. Rar'ed they're about 350k.
>
><!-- ~MESSAGE_AFTER~ -->
>> Stay informed about: AX6BC squealing