how to connect my three contacts

[Ander]

i have pump alphacool eispumpe vpp755
i have 3 connections 4-Pin; 3 pin and 4 pin molex
how must connect each this three pins?

 

[Eddy]

The big 4-Pin Molex is for power. The small 4-Pin connector is for PWM controlling and to read out the rpm. The small 3-Pin Molex is only for read out the rpm of the pump. The small 3-Pin is only needed if you dont have a 4-Pin PWM connector on your mainboard.

 

[Ander]

So, 4 pin MOLEX is required to connect to the power supply,
then I connect the small 3 pin or 4 pin, one of them, right?

on my motherboard z390 aorus ultra i have sys_fan, sys_fan_pump, cpu_fan, cpu_opt
which of them is the 4-Pin PWM connector?
i have free cpu_fun, my be connect here?

 

[Metropolis34]

4 Pin Molex to the PSU
The small 3 Pin is for the RPM/Tacho signal
The small 4 Pin is for the PVM function.

You need to check out the manual of your mother board. All the information that you need how to connect the pump is written there really.