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On Mon, 01 Mar 2010 16:52:36 +0100, Warp <war### [at] tag povray org> wrote:
> "Jeremy \"UncleHoot\" Praay" <jer### [at] questsoftware cmo> wrote:
>> I was able to achieve 4.2GHz, but heat became a serious problem. I was
>> using Prime95, and temps were approaching 80C.
>
> I thought modern CPUs automatically throttle to lower clock frequencies
> when they get too hot.
They do, but the trigger temperatures are higher than that. I think
The main reason for keeping the temperature below a much lower threshold
even the parts of the CPU that are not close to a thermal sensor stay
> Or does overclocking mean that you are actually bypassing that protection
> mechanism and forcing the CPU to run at a given frequency regardless of
> temperature?
No, but there are other things that can cause a CPU to fail (or even
outright destroy it) when over-clocking, e.g.:
- Local overheating distant from a thermal sensor.
- Voltage drops.
- Excessive leakage current.
--
FE
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