Intel Dual-Core CPU temperature Range?

I am a bit puzzled by exactly what is the reasonable temperature range for an Intel Dual-Core CPU. I currently own a PPC MacMini which never goes above 43C. I also have a system with Athlon64 and the CPU doesn't go over 50C. The number of 80C just seems unreasonable.
While I can understand some people think the high temperature is ok as long as the surface is not uncomfortable to touch, I can't help but wondering what effect it has to the CPU itself; or to the other components.
Anyone knows where to find such information (operating temperature range) from Intel?

You are familar with desktop processors and their associated temperatures. It is fairly common for notebooks CPUs to run anywhere between 50C - 80C. Intel specs the Core processors to 100C before the CPU starts throttling down to reduce the CPU temp.

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