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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.
Selection of direct drive fans (those with the motor shaft. connected to the fan wheel or propeller) is nearly the. same as belt drive selection. However, there are two. differences worth noting. Where belt drive fan speed can. be altered by adjusting the motor pulley, direct drive fans. (since they have no pulleys) must use a different method. To adjust a direct drive fanâs speed (also motor. speed) or to provide a means of meeting an exact. performance requirement, a speed control can be. furnished.