Ideally what I'd like to do is pull the PWM control from the fan header on the GPU, and put that into some kind of controller to adjust the speed of the pump. The pump does not support PWM, though.

The science pros at The King of Random build a low-cost variable power controller and explain how it works. Donald Trump to ...

Not only will you get smoother video playback—goodbye Flash!—but you'll be able to speed up and slow down your videos. The variable speed control is great for seeing things in slow motion.