> I am unsure. One would hope that powering down the system if a hard-limit 
> temperature is reached *is* in hardware rather than software. OTOH, here 
> we have a laptop which got sufficiently hot for the CPU to malfunction 
> fairly seriously, yet still the power remains on.

http://www.tomshardware.com/reviews/hot-spot,365.html

It's quite old, but the basic outcome seems to be that the Intel CPUs are 
impossible to damage by overheating.  With the AMD chip it relies on the 
motherboard, but their demo shows that a motherboard temperature sensor 
cannot react quickly enough to avoid frying the CPU when the HS comes off.

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