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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.
Here is a picture of a standard (clockwise) rotation Ford fan. This one happens to be an 18 5 blade fan. Note that you are viewing it from the engine side in this picture. Compare the angle/tilt of the fan blades to the reverse rotation fan in the next picture to see the difference. Here is a picture of a reverse (counterclockwise) rotation Ford fan. This one happens to be an 18 5 blade fan. Note that you are viewing it from the engine side in this picture. Compare the angle/tilt of the fan blades to the standard rotation fan in the previous picture to see the difference.