Why is my fan loud during high memory usage?

When I'm syncing my iPhone or watching YouTube my fan is extremely Loud

Because it is heating up so it needs to be used faster.

High memory usage means that CPU have to do more things to that process. So it make too heat. Then fan speed need to increase to cool the CPU.

Which fan? Gpu or cpu? During high demanding programs fan speeds up cool processor faster. But all fans inside tower are silent or very little audible dust must have accumulated in motor clean up dust and everything will be fine.

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