This feature will determine the installed fan’s minimum speed and minimum PWM duty cycle. If the fan settings are difficult to find, please refer to your motherboard’s manual to find out how to enter the fan settings.įirst, depending on the motherboard model, it may be necessary to run a fan test, often called “Tuning”, before being able to adjust fan speeds. Depending on the motherboard manufacturer and motherboard model, the fan settings can be found in either the hardware monitor, Qfan control, the system tab, Smart Fan Mode, or a similarly named setting. Once in the BIOS/ UEFI, navigate to the fan settings. Sometimes another key (such as F2) needs to be pressed on start-up – this information will be displayed on the start-up screen or is otherwise mentioned in the motherboard’s manual. To enter the BIOS or UEFI of your motherboard, press the DEL key on your keyboard as the computer boots up. While fan speeds can be adjusted by using fan control programs as well, we recommend setting the fan speed via the PC’s BIOS or UEFI to avoid any software issues. too steep, too high fan speeds at low temperatures) and are, of course, not fine-tuned to a specific fan model. The default fan curves can be set too aggressively (i.e. ![]() If you want to further optimise your fans’ sound and performance, we recommend setting a manual fan curve in the BIOS after setting up your PC. ![]() Therefore, for use in a PC, we would strongly recommend using 4-pin PWM fans and to control them via PWM through the motherboard’s BIOS or UEFI whenever possible. However, when controlled via PWM, the fan speed can be adjusted more precisely, and it can be set to lower values compared to voltage contro l. It is also possible to control 4-pin PWM fans by adjusting the supply voltage. Many motherboards can control fans both ways, by setting the fan mode to “DC/ Voltage” or “PWM ”. The fourth pin allows for PWM speed control via the motherboard, or even another device that is capable of controlling PWM fans.ģ-pin fans can only be controlled by adjusting the voltage that they are supplied with. Our Noctua 4-pin fans are easily identified by “PWM” in their product name. (There are some exceptions when using pre-built systems from manufacturers such as Acer, Apple, Dell, HP, Lenovo, etc. If a fan stops at 0% it will be mentioned in the fan specifications on our website :įans used in computers are usually either 3-pin or 4-pin fans. Most fans will stop at a duty cycle of 0%, while some are designed to keep running at 0%. The duty cycle is a percentage, where 100% means running at full speed. The PWM signal resembles a square wave that regulates fan speed via its duty cycle.
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