Those systems are already stressed enough as it is. You can actually cause the chip to FRY if you keep that up.
"Now I could up the auto shutdown to say 100
I have a computer with an AMD 2.2 Gig processor which turns itself off. I notice if I block the air vents it hardly makes it through the boot. So it is obvious that it is the excess heat is doing this. I found in bios a section where i can monitor the temp of the processor, it reads around 70