cpu temp fluctuating question

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dish_moose
Newer CPUs will fluctuate a greater amount than older generations of CPUs in part because they have much smaller structures on a smaller piece of silicon. Because there is less thermal mass, they can heat/cool much faster. Newer CPU also have a less efficient way of extracting heat - they use thermal compound between the silicon & the metal heat spreader. Some older CPUs were soldered to the heat spreader giving them better capability to extract heat which meant they did not heat up as quickly. And as mentioned above, depending on what the CPU is doing at any given moment(frequency/voltage) it will generate different amounts of heat.
-Bruce
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n0ns3ns3

n0ns3ns3

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May 25, 2016
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because the CPU load fluctuates and thus voltage, current and frequency = TDP also fluctuates.
in order to get stable temperature you need to create a very stable load. This is usually done for thermals testing.
You don't need to worry as long as the max temps are within spec.
 
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B

Benjamin Barrois

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Dec 9, 2014
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By default, the CPU adapts its frequency and voltage depending on what it is asked to do. When idle, it often stays at 0.8 MHz for instance with 1.3V, whereas with full load it will increase voltage to 1.4V and frequency to 4.0 GHz. Heating is linear on frequency and quadratic on voltage, so temps are likely to increase quite a lot under heavy load. However, with your cooling it shouldn't go above 60°C I guess.
 
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dish_moose

dish_moose

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Jul 7, 2010
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Newer CPUs will fluctuate a greater amount than older generations of CPUs in part because they have much smaller structures on a smaller piece of silicon. Because there is less thermal mass, they can heat/cool much faster. Newer CPU also have a less efficient way of extracting heat - they use thermal compound between the silicon & the metal heat spreader. Some older CPUs were soldered to the heat spreader giving them better capability to extract heat which meant they did not heat up as quickly. And as mentioned above, depending on what the CPU is doing at any given moment(frequency/voltage) it will generate different amounts of heat.
-Bruce
 
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