I normally do not cover P.Rs but this one deserves an exception I think. To the well experienced hand, Noctua coolers have something of a legacy. These coolers use an extremely minimalistic design and delivered top notch performance on Air, all the while remaining surprisingly silent. One such cooler was the NH-D14 which is now nothing less than a legend in the air cooler hall of fame. It took Noctua three full years to develop a worthy successor to the NH-D14; the NH-D15, which debuts with a six year warranty. And it goes without saying that it has very big shoes to fill.
NH-D14 succeeded by the Noctua NH-D15 Dual Tower Air Cooler
I will begin with the differences between the NH-D14 and NH-D15. The heatpipe count remains the same, i.e. six. The finstack is now wider by 10mm which corresponds to a total of 150mm. Height and width are 165mm and 135mm respectively, each having received a 5mm increase. The fins on the lower side have receded and now give 64mm clearance in single fan mode. Nf-A15 PWM fans are added with a range of maximum 1200 rpm or 1500rpm depending on the PWM controller or LNA. Here is what the CEO of Noctua had to say: