The Sentry Mesh is setup in such a way that no less than 40% of the maximum 12V of power courses through the veins of each cable at all times. This means that in the potentiometer's lowest position, the fans are still providing necessary airflow for your components while being virtually silent. This differs from the Sunbeamtech Rheosmart 6, where the potentiometers had a voltage range from 0V (off) to full blast as 12V. I prefer NZXT's method, particularly so with my Noctua case fans. They are quiet enough to begin with, but are virtually silent when the sliders are set to their lowest setting of 40% voltage. This feature also ensures that no matter how low the sliders are set, there will always be some air circulation.



Link: Overclockersclub