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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.
A fan clutch is supposed to be a fluid coupling device that allows the fan to rotate less than the engine speed. The fan clutch should engage before the engine gets up to 220F. A standard cooling system fan clutch should spin at 33% of water pump speed (RPM) when not engaged and 75% of water pump RPM when engaged. A heavy duty cooling system fan clutch should spin at 33% of water pump speed (RPM) when not engaged and 90% of water pump RPM when engaged. Unfortunately, a fan clutch can slowly empty its coupling oil overtime and often seizes. (the oil also can gel/thicken and grab).