Now if the load is smaller (or idle) your CPU is also cooler. However, your CPU isn't 80° hot, it is 'X° hot - work of cooling'. When your CPU is under heavy load, it 'produce' more heat. The heatsinks, fans and other cooling solutions are doing a pretty awesome job cooling the system. Lowering the max CPU speed will result in less heat production, this a cooler system. Mac's (and other system) use thermal throttling a lot, especially when being passively cooled. When you turn the burner off, it very quickly cools down to not-glowing temperatures, but it will take a long time for the temperature to go all the way back down to room temperature because the pot of water is still holding a lot of heat. If you boil a pot of water, the heating element will heat up much more quickly than the pot of water, and can get hot enough to glow red. This is why when you start a stress test the temperature will jump up almost instantly, but then slowly creep up as the heatsink comes up to the new equilibrium temperature.įor an analogy: The CPU core(what you're measuring), is the heating element of a stove, while the heatsink temperature is the pot of water on top of it. It takes much longer for the average die temperature or the heatsink temperature to change. As the silicon in a CPU has the same atomic structure as diamond, it has a very high thermal conductivity, so when heat stops being generated in this particular core, the core temperature drops to the average die temperature very quickly. The temperature sensor you're reading is most likely part of the silicon die, and inside a particular CPU core(which is very small, so it doesn't have much thermal mass).
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