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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.
Setting a Minimum CPU Fan Speed (CPU Fan Speed Not Constant at Idle) I have an AMD FX 8350 CPU (currently with stock cooler/HSF) on a Gigabyte GA-78LMT-USB3 mobo (rev 5.0). When my CPU is idle, the CPU fan speed constantly varies between 2170 RPM and 2336 RPM (and several speeds in between). This lack of a single constant RPM speed results in a change in audible frequencies that generates a subtle but annoying hum/whir sound at some of these lower frequencies.