"All the devices connected to my PWM splitter work at 100% but I cannot vary their speed"
Check that the splitter mini-4 pin PWM signal cable is correctly connected to the CPU_Fan connector of the motherboard
Enable "Manual Fan Control" in the motherboard BIOS
"The device(s) connected to my PWM splitter do not work"
Check that the splitter power cable is connected to the power supply
Check that the non-functioning device female 4-pin connector is correctly inserted in all 4 pins of the splitter connector: in effect, it may be possible to inadvertently offset the female connector by one pin by slightly forcing its insertion, so be careful about this!
"I am getting a "CPU fan error" when I turn on the computer"
Make sure that a device is connected to channel 1 of the PWM splitter. If the motherboard CPU_Fan header does not read an RPM signal, it will return such error by default.
Check that the device connected to Channel 1 of the PWM splitter is correctly inserted in its connector.
Check that the power cable of the PWM splitter is connected to power supply.
"I connected the PWM splitter to an auxiliary 4-pin connector that was indicated as PWM capable by my Motherboard manual, but I can't vary the speed of my devices"
Other than the CPU_Fan connector which is PWM enabled by default, most of the motherboards 4-pin connectors feature two methods of speed adjustment in order to allow control of both types of fans, the 3-pins which are voltage controlled, and the 4-pins which are PWM controlled. As a result, the PWM functionality must be enabled in the BIOS before it can actually work. Please consult your motherboard manual for a "how To".
Since the "CPU_Fan" motherboard connector is PWM enabled by default, we recommend that you connect the splitter to the CPU_Fan connector in order to ascertain its functionality.
"I am connecting the splitter to a PWM fan controller instead of the motherboard, and it doesn't work"
Not all PWM fan controllers are compatible. Please read this white paper for further explanations and a list of compatible devices.
HiTech legion, Gabe Rouchon Interview, CES 2016 product Line presentation
Linus tech Tips, CES 2016 product Line presentation