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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.
Best Answer: dBA = decibels..how loud it it is. Decibel is a logarithmic scale of sound. Higher dBA is louder. http://en.wikipedia.org/wiki/Decibel http://www.gcaudio.com/resources/howtos/... RPM = revolutions per minute, speed of fan..how fast the blades are turning.Note the faster it turns the higher pitch the sound will be.It will typically be louder/more noticeable when talking of fans.http://en.wikipedia.org/wiki/Revolutions...CFM = cubic feet per minute, how much air it is moving.PM = revolutions per minute, speed of fan..how fast the blades are turning. Note the faster it turns the higher pitch the sound will be. It will typically be louder/more noticeable when talking of fans. http://en.wikipedia.org/wiki/Revolutions... CFM = cubic feet per minute, how much air it is moving.