Re: CPU: 80-85C

In article <o_-dnQI8IP1Rx6HeRVn-vA@xxxxxxxx>, "chris"
<chrisNOTSPAM@xxxxxxxx> wrote:

> 135degC? I would think that the CPU would be toast long before it gets to
> that temp.

Actually, I went back and checked a couple of datasheets. A P4
2GHz processor has THERMTRIP set at 135C. A Prescott in LGA775
package is set to "approximately 20°C above the maximum Tc",
which would be on the order of 90C. I would think the trigger
point would be set according to the ability of the package
materials to take the combination of temperature (and heatsink
contact pressure). I couldn't find any docs in plain English, to
explain how the temperature setting was chosen.

135C sounds like a good temperature for a silicon die limited
performance, while 90C is what you would use if the package
is going to degrade before the silicon die does.

Paul
.

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