The CPU diode temperature is the important one. The thermal diode is a single transistor on the CPU die, identical the the million of others on there, wired up such that YOU can use it to measure the temperature inside the CPU.
And it won't do BOOM, it'll lock-up or give lots of errors. A year or so back on a dare, I ran Prime95 on a Palomino (stock voltage and speed) while throttling down the water flow. It was still stable at 96 C and 1.5 liters/hour.
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