CPUs include a heat sink, which dissipates the heat from the processor, preventing it from overheating. The heat sink is made out of metal, such as a zinc or copper alloy, and is attached to the processor with a thermal material that draws the heat from away the processor towards the heat sink. Heat sinks can range in size from barely covering the processor to several times the size of the processor if the CPU requires it.The CPU fan attaches to the heat sink, pulling air through the fins. By dissipating heat drawn into the heat sink, the fan indirectly cools the processor.
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