To power the pump on your O11 distro plate without using your motherboard, you can connect the 4-pin PWM connector to a dedicated fan or pump header on a fan controller or use a 12V DC power supply with a 4-pin PWM adapter. Another simple option is to use a powered fan hub that connects directly to your power supply through a SATA or Molex connector. Just make sure the hub supports PWM and 12V output, so the pump runs safely and at full power for testing.