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Auto Fan Control setting: Target Fan Speed? |
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parsec ![]() Moderator Group ![]() ![]() Joined: 04 May 2015 Location: USA Status: Offline Points: 4996 |
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Before I explain these two parameters, I must list a few requirements that must be met in order for the explanation to apply: The CPU Fan 1 & 2 Setting option must be set to Automatic. 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 fan used on the CPU Fan 1 header (labeled CPU_FAN1 on the board) must be a four pin, PWM speed controlled fan. A three pin voltage speed controlled fan cannot have its speed controlled on a four pin PWM fan header. Any three pin fan used on this header will run at its maximum speed. Target Fan Speed is the minimum speed a PWM fan connected to the CPU_FAN1 will operate at. All 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. 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. You will need to experiment with the Level settings in order to find one that meets your needs. 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 of course can set the minimum fan speed however you prefer. If you use one of the newer or newest UEFI/BIOS versions, you may also see an entry called Custom Speed. Some ASRock boards with Intel 7 series chipsets have this setting, I don't know if your board's UEFI/BIOS will. Selecting this setting will reveal another option, Custom Fan Speed. That setting is a number from 1 to 255, which again selects the minimum speed the fan will operate at. This option simply provides a wider and finer range of minimum speeds. Target CPU Temperature is the threshold temperature for automatically increasing the speed of the fans on the CPU Fan 1 and 2 headers. I must say that in my experience with my ASRock Z77 Extreme4 board, that the Target CPU Temperature does not have much affect. Using the lowest setting, 45C/113F, the CPU Fan 1 and 2 speeds will increase before the CPU temperature reaches 45C. IMO, that is fine. You can experiment with that option if you want to have a quiet PC, and only increase the CPU fan speeds when the CPU temperature is say 60C for example. A simple way to try different fan speed settings is to install the ASRock Extreme Tuning Utility. Its Fan Control feature provides the same settings as in the UEFI/BIOS. You can change the fan speeds and Target Temperature (but not from Automatic to Full On) to see what you like or for special purposes. These settings do not change the settings in the UEFI/BIOS. |
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AndreyT ![]() Newbie ![]() Joined: 30 May 2015 Status: Offline Points: 4 |
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I have an ASRock Z75 Pro3 LGA 1155 board, which offers automatic CPU temperature-based fan speed control in its BIOS settings. When I switch a fan to Automatic mode in BIOS, it asks me to specify two parameters: Target CPU Temperature and Target Fan Speed.
My question is: how exactly do these two parameters work together and how do they affect fan speed? What 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. Edited by AndreyT - 30 May 2015 at 5:37am |
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