The third wire provides feedback on the actual RPM of the fan. Fans with 4 wires are controlled through pulse width modulation (PWM), in theory a more efficient way of controlling the fan speed. See Lm_sensors for generic details.įans with 2 or 3 wires may have voltage regulation: higher voltage (typically up to 12 Volt) results in higher rotation per minute (RPM). Specific hardware may have specific needs with respect to kernel configuration. A typical PC fan will have a minimum required voltage that must be supplied to keep the fan spinning at all. ![]() Fans that allow their speed to be controlled PWM is the preferred method of fan control.A motherboard capable of regulating fan speeds.A BIOS that allows users to control the fan speed.Higher temperatures cause more wear on the electronics, resulting in a shorter lifespan.Ĭontrolling fan speed is not supported on all computers.What if the program controlling the fans fails? The computer could overheat and parts could be destroyed.There are two risks when manually controlling fan speeds: You can combine individual fan curves into a Mix group You can assign a fan curve to fan that is connected to a fan header, or you can assign it to a 'Mix group'. It is generally considered more safe to have the BIOS or dedicated hardware control the fans. Create as many fan curves that you want or need Each fan curve can be assigned to a thermal sensor (CPU, GPU, or whatever sensors the motherboard is reporting).
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