![]() ![]() If you don’t care about manual control you can also let the system take care of itself – modern motherboards work within safe specifications which will cool your computer reliably at all times. The control can be handled by using bespoke tools in the operating system or the BIOS/UEFI – or by using the switches on top of our cases. PWM fans can be used everywhere: For cooling the CPU and the case, or on top of a radiator. Which can only cause problems on older models as PWM support has been standard in modern systems for quite some time now. Which of course means that the motherboard, where these pins are connected to, must support them. ![]() From the outside on the other hand you will be hard-pressed to find a difference – with the main exception of the connector: Regular fans have three pins, the PWM colleagues feature one more for the fan control. A typical PC fan will have a minimum required voltage that must be supplied to keep the fan spinning at all. But the thing is: The fans have to be able to deal with the constant fluctuation! This means they have to be more complex inside, which of course makes them more expensive than their simpler counterparts. Power up to 10 PC fans from a Single 4-Pin Motherboard PWM Fan Header In the hub interfaces, the White interface of FAN1 is the CPU fan dedicated interface. PWM is the preferred method of fan control. If they are rare then the fan will rotate slowly, and if they are frequent then it will spin fast. ![]() Simply put works by continually switching the power on and off, which in conjunction with the mass inertia of the fan’s motor makes it rotate faster or slower – depending on how long and frequent the “ON” phases of the power are. ![]()
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