That setting is a number from 1 to 255, which again selects the minimum speed the fan will operate at. Selecting this setting will reveal another option, Custom Fan Speed. Some ASRock boards with Intel 7 series chipsets have this setting, I don't know if your board's UEFI/BIOS will. If you use one of the newer or newest UEFI/BIOS versions, you may also see an entry called Custom Speed. You of course can set the minimum fan speed however you prefer. Normally that is the setting that cools the CPU adequately when it is at idle/low load, and is not so loud it bothers you. You will need to experiment with the Level settings in order to find one that meets your needs. That is why you see the Level settings, from 1 to 9, that allows you to select the minimum speed the fan will operate at. Target Fan Speed is the minimum speed a PWM fan connected to the CPU_FAN1 will operate at.Īll fans, whether PWM or voltage speed controlled, operate at different minimum and maximum speeds, and need differing amounts of voltage to start spinning, and maintain a certain speed (RPM.) There are no standards for a fan's maximum speed, minimum speed, start up voltage, and maximum power usage, that are used by PC fan manufactures. Any three pin fan used on this header will run at its maximum speed. A three pin voltage speed controlled fan cannot have its speed controlled on a four pin PWM fan header. The fan used on the CPU Fan 1 header (labeled CPU_FAN1 on the board) must be a four pin, PWM speed controlled fan.
The Automatic setting will increase or decrease the speed of the fans connected to the CPU Fan 1 and 2 headers, depending upon the temperature of the CPU. The CPU Fan 1 & 2 Setting option must be set to Automatic. My question is: how exactly do these two parameters work together and how do they affect fan speed? W hat is the meaning of Target Fan Speed parameter? How is Target Fan Speed related to Target CPU Temperature? There's no explanation in the manual.īefore I explain these two parameters, I must list a few requirements that must be met in order for the explanation to apply:
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