As per the Domino, CoolIT's ECO ships with its own 120mm fan firmly attached to the cooler's radiator. Whereas fan speed on the Domino was controlled by a button on the unit itself which allowed you to cycle through three performance profiles, this time around the 120mm fan is controlled via a four-pin PWM header on the motherboard itself, allowing the ECO to adjust fan speed dependant upon CPU temperature up to a maximum of 1800 RPM. We're a big fan (with every pun intended) or PWM-controlled fans here, so in our book this is a definite improvement over the manual controls offered by the Domino, although of course your mileage may vary.