Steve Underwood wrote:
> Rogier Wolff wrote:
>
> > Zulfiqar Naushad wrote:
> > > I have never heard of a chip being fried, and still working at it's
> > > original speed rating.
> >
> > That indeed sounds unlikely.
> >
> > > It could be something else, like the BX chipset or Memory, or something else.
> > >
> > > Besides, 99.9% of CPU's have some sort of thermal control.
> >
> > I've never heard of this.
> Its true for most Intel parts. Its probably true for other makes of
> processor too. If they get too hot, they slow themselves down. I
> think this started with the mobile parts, but they all seem to have
> this feature now. I don't know if there are any registers where you
> might detect that this has happened.
The Transmeta TM5400 is the first chip to do this.
You may be confused with the fact that a chip at 25 degrees may be
able to achieve 450MHz, while that same chip "gets slower" when heated
to 75 degrees. It will only be able to do 400MHz or something like that.
This is inherent in the silicon. If you clock your CPU at 440MHz, it
will work when it's still at room temperature, but make errors when
it's been busy for a while.
It won't magically reduce the clock speed, unless its a transmeta. And
they have the patent.
An OS that notices the CPU getting too hot may decide to idle a
certain percentage of the time, cooling off. There is not much
"automatic" about this, and it won't happen under Linux.
Roger.
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