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The cooling of all PC components rests on that warm air is drawn out of the housing. As a rule the power unit cannot provide a good ventilation of the housing, without its fan running at a high number of revolutions therewith causing much noise.
An additional fan like the Arctic Fan 3 solves this problem. The power unit fan can substantially lower its speed and thereby work more quietly. The ventilation of the housing using two fans produces at the same airflow less than half of the noise.