3 pin fans will operate at full-speed run, because they lack PWM speed control function.

Note: Fans connected to this hub only display as one fan and speed in your BIOS and whatever GUI you use.Can Also be used with all Darkside PC LEDs.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.1x PC FAN PWM 10 Channel HUB SATA Port Power Supply 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. 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. 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.

Pc fan pwm