"Noctua have really out done themselves this time, the NH-D15 is a marvel in terms of performance and as you’ve seen in our benchmarks, it flattened the competition by a wide margin when it came to overclocking our CPU. 9c cooler than the nearest air cooled rival is like Lewis Hamilton coming out in a new car that shaves off 9 seconds a lap. Then there are the water coolers which were beaten by this cooler, several of which are more expensive than the NH-D15 and several of them are regarded as some of the best cooling solutions on the market."
Peter Donnell - eTeknix.
Noctua NH-D15 CPU cooler review by eTeknix - Introduction & Conclusion.