"159Noctua951 's flagship model NH-D15 is a dual tower cooler of the elite class, based on the legendary NH-D14 and continues its quest for ultimate cooling performance with maximum smoothness consistently. Due to its wider heatpipe layout and two NF-A15 140mm premium fan with PWM support for fully automatic speed control of the NH-D15 can improve the efficiency of the award-winning NH-D14 again.