"Micro Cooling Fan" Speed is the number of revolutions per minute fan fan page, the unit is rpm. Fan speed resolution together by the motor inside the coil turns, working voltage, the number of fan fan pages, inclination, height, diameter and bearing system. In the fan layout is fixed, the DC fan (that the use of DC fans) the speed of change with synchronized operation voltage change. "Micro Cooling Fan" after the rotational speed of the internal speed signal can be measured, can be measured through external (external measure is to look at how fast the fan switch with other instruments, internal measure directly to the BIOS can see, it is possible to go through Software Look internal measure relatively large number error). "Micro Cooling Fan" speed and heat can not directly contact the cooling air flow is resolution to the foundation conditions, higher fan speed will bring more noise, if the air flow is similar to the purchase of the radiator can speed product selection Low fan, will be in the use of quieter.