Ahh, that probably would have helped.
I am just trying to have the pump be variable speed so when the temperature is low/computer is not being used much then automatically increase speed when temperature is higher such as gaming or video editing.
The pump runs at 41xx rpm. I would like to extend its mttf by allowing it to decrease speed. Of course, since the pump does not have a speed controler it must be controlled by something that can change its voltage.