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2. RPM can also refer to the revolutions per minute a computer case fan or heat sink fan spins. With a high RPM, the fan will move more air or remove more heat from the computer or processor.However, keep in mind that as you increase the RPM of a fan the noise or decibel (dBa) also increases.1  A computers fan RPM can be measured using software tools such as HWMonitor.ith a high RPM, the fan will move more air or remove more heat from the computer or processor. However, keep in mind that as you increase the RPM of a fan the noise or decibel (dBa) also increases. 1  A computers fan RPM can be measured using software tools such as HWMonitor.
In these engines, the radiator cooling fan is attached to the water pump by the radiator fan clutch. In some systems, known as non-thermal fan clutches, when the water pump spins, the cooling fan spins. So these types of fan clutches react to speed. In the more sophisticated thermal fan clutch there is a thermostatic spring that controls fluid flow to engage and disengage the fan clutch from the water pump.