Question MSI mac coreliquid 360R V2 pump running full speed

Why do you want to. Most AIO pumps are designed to run at full speed. The pump itself should be almost silent the fans running at even slow speed will be louder.

It all depends on if the pump is designed to run at less RPM. You I guess could try to change the fan curve values for the port the pump is connected to on your motherboard. It may or may not respond.

In most cases you just leave the pump run at 100%.