Tested with Noctua 120mm, Noctua 140mm PWM, NZXT and Artic Cooling. Circuit will allow RPM control on any 12V pc fans. You can change the fan speed from off to max speed. Thanks to the PWM speed control, 4-pin fans can run quieter than 3-pin fans.How to make simple 3-pin and 4-pin PWM pc fan speed control with Arduino. When you connect a 4-pin fan to a 3-pin header, the 4-pin fan’s speed will be voltage controlled, similar to a 3-pin fan. You have to use the voltage-controlled mode on the BIOS fan control settings to control the speed of a 3-pin fan connected to a 4-pin header.īoth 3-pin and 4-pin headers can also control the speed of a 4-pin fan. Conclusionīoth 3-pin and 4-pin motherboard fan headers can control the speed of a 3-pin fan. So 4-pin PWM-controlled PC fans can run at much slower speeds, making them quieter than 3-pin fans. On the other hand, PWM fan control doesn’t suffer from this issue it uses a fixed 12V voltage to drive the fan and switch it on and off at a high frequency to control the fan speed. So voltage-controlled fans can’t run at very low speeds, making them noisy even at their slowest speed settings. PC fans require a certain minimum voltage to operate if you lower the voltage below that level, the fan will stall. Generally, 4-pin PWM-controlled fans are better than 3-pin voltage-controlled fans. In this case, the 4-pin fan’s speed will be voltage-controlled using pin number 2 of the 3-pin header, similar to a 3-pin fan. The 3-pin fan header is compatible with the first three pins of a 4-pin fan, and the fourth pin (PWM) can be left unconnected. On the other hand, when the motherboard has a 3-pin fan header, you can still connect 4-pin fans to it. When the motherboard has a 4-pin PWM fan header, it can control the speed of a 4-pin fan by changing the PWM signal on pin number 4. Can All Motherboards Control The Speed Of 4-Pin Fans?īoth 3-pin and 4-pin motherboard fan headers can control the speed of a 4-pin fan. Then the 4-pin header will change the voltage of pin number 2 to control the speed of the 3-pin fan. So you have to enable the voltage-controlled mode on your BIOS fan control settings to control the speed of a 3-pin fan on a 4-pin header. So the 3-pin fan will run at its maximum speed, and you won’t be able to control its speed. However, if PWM fan control is enabled in your BIOS settings, pin number 2 of the 4-pin header will have a fixed 12V level. The first three pins of a 4-pin header are compatible with 3-pin fans, and the fourth header pin is not required. On the other hand, when the motherboard has a 4-pin PWM fan header, you can still connect a 3-pin fan to it. When a motherboard has a 3-pin header, it can control the speed of a 3-pin fan by changing the voltage of pin number 2. Can All Motherboards Control The Speed Of 3-Pin Fans?īoth 3-pin and 4-pin motherboard fan headers can control the speed of a 3-pin fan. So the speed of a 4-pin fan is PWM controlled. The motherboard changes the PWM signal on pin number 4 to control the fan speed. In 4-pin fans, pin number 4 is the PWM input. So the speed of a 3-pin fan is voltage controlled. The motherboard can change the voltage of pin number 2 between 5V and 12V to control the fan speed. In 3-pin fans, pin number 2 is the variable voltage input. There are two types of PC case fans: 3-pin type and 4-pin type.
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