A good CPU heat sink and fan keeps the processor from overheating, especially under high computational load. But the processor will still get hotter than when idle (e.g., 25 degrees C difference).
Once the load drops back to idle, a good processor fan will rapidly cool the chip back to idle temperature. A bad fan will take longer. Does the rapid cooling cause more mechanical stresses and potential for harm than slower cooling?
If so, it seems challenging to design the optimal feedback of fan speed controlled by temperature.
Inspired by annealing.
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