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Just to note: This is general information for computer fans and fan system in your computer may work a bit differently. For example, 1200 rpm on my MacBook Air7,1 make no sound at all. #Smcfancontrol mac cannot set new fan speed macThis does not mean that every mac fan can be heard at that speed, this depends on the hardware. #Smcfancontrol mac cannot set new fan speed softwareIt could be that software is designed in such way that it will not set fan's voltage below starting voltage for safety reasons. Yes, 1200 rpm is the default minimum fan speed on my iMac17,1, too, and it is normal that fan noise can be heard at this speed on this machine in a quiet environment. That voltage is lower than minimum voltage needed for the fan to rotate. Fan needs a certain voltage to start rotating. Is that right behaviour And when smcFanControl is opened - command /Applications. But fan speed remains equal to manually set despite very high temps. The labelling isnt ideal, so you may need to play around to find the right one for your system. Otherwise, select Configure then select the Advanced tab. It could be that there is a software setting which would prevent fan from working so slow as to provide uninterpretable speed output.Īnother point is fan starting voltage. I expected fan speed to be equal to manually set in settings when 'official' speed is lower and 'official' speed when it's higher than manual, so fan could reach max speed under high load. When you feel youre ready to take some control, you can select Automatic fan speed to have Speedfan automatically control your system. When the fan is operating very slowly or when the input voltage is very low, it may provide signal which is so deformed that the fan control circuitry could have serious problems getting any useful information form it. It works by detecting magnetic field change as the fan rotates and it creates a number of pulses for each revolution of the fan. The " Macs Fan Control" software is able to control the. :( The beta version does, however, correctly display fan speed and temperature. In the fan assembly there is a device called Hall effect sensor. HDD Fan Control Reduce Fan Noise and Protect your Drive. As the title says, smc doesn't control the fan. I did some experiments with oscilloscope, fan and a power supply with variable voltage.įan usually reports its speed using pulse width modulation. Does the minimum level have some more complex effect in calculating the fan speed? ![]()
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