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PWM or Voltage

evenst3ph3n
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Hi just complered my first waterbuild on a Auros Z270X Gaming 9 Mobo. I have an EK 140 res pump combo. It is a 4 pin PWM and powered by molex. I have connected it to the 4 pin header for a system fan/pump. In the bios for this header (6) I have a choice to set PWM or voltage I watched a youtube vid. and they suggested voltage but shouldnt I put the setting to PWM. 

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If it gets power from the molex connector, chances are it doesn't matter. Are all 4 pins used, or is it just a 4-pin connector with only one cable connected to it?

(Alternative, which exact model are you using?)

 

EDIT: I see that many such combos have actual PWM control for the pump speed. In that case, you should use it as PWM unless you want the pump to run at 100% all the time (which it seems it will do if no PWM signal is present).

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