Also known as a "processor cooler", a CPU cooler is used to cool the processor on the motherboard. Normally cooler-fan combinations are used, but there are also passive cooling systems and water cooling. There are different sizes and variants, depending on the space in the case and the built-in processor. There are also all-in-one water cooling systems in which the heat sink for the CPU is already connected to the radiators and the system is filled with liquid.
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