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Most computers nowadays have a automatic temperature control included in their BIOS or EFI firmware. It will decide whether to turn the fan on or off, and how fast it spins depending on how hot your computer's running. Usually this fan control will only work with fans that has PWM (pulse width modulation). You can tell this if your fan header has 4 (2 for power, 1 for sensing fan speed, and 1 for controlling fan speed) pins instead of 3.

Some computers will also have a throttling feature as well in which it will attempt to reduce your computer's performance in order to reduce the amount of heat it's generating until it reaches a certain temperature point.

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