Which area exhausts hot air and which area cools the cpu?

the metal part (the heatsink) removes hot air from the cpu and the fan exhausts it out the side, just like an engine, which uses coolant and a radiator to remove heat for optimal performance.

the answer to your question would be something called hertz. the unit of measurement called a hertz, which is one cycle per second, is used to measure clock speed. within one cycle, your computer processes, refreshes, or updates itself to the changes that it is going through. in the case of computer clock speed, one hertz equals one tick per second. the clock speed of computers is usually measured in megahertz (mhz) or gigahertz (ghz)

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