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With the increase in magnitude of the usage of computers to more than 18 hours a day, there are additional demands placed on the processor. The processor then starts generating a lot of heat which is caused by the internal electrical energy of the components, and gets warmer the harder the components have to work. Improper maintenance of heat and overheating of the processor can reduce the lifespan or cause irreparable damage to the components in the processor, including components like circuits, microchips, RAM, or hard drives, and makes the computer inoperable. In order to avoid damaging the components and prevent loss of data, it becomes essential to have good cooling equipment like a CPU fan.
Nominally cpu fan needs 12v to rotate but it depends on fan's quality and it's desired fan rotation speed. The fan gets it's required power from motherboard's 3 pin fan connector. We van see one or two two pin fan connector to connect external fans. And this on board extra fan connectors are called Rare Fan Connector.
