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Adjust pc fan speed8/15/2023 ![]() ![]() 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. By controlling the fan via a PWM signal.The fan speed can either be regulated by adjusting the supply voltage (DC, lower voltage = lower speed).There are two main options for adjusting the fan speed via a computer’s motherboard: In the following guide we want to give a brief introduction to setting manual fan curves. Solution home Frequently Asked Questions General FAQs How do I optimise my fan settings?
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