"Considering that this cooler exceeded the cooling performance of the NH-U12S and the NH-U14S, and matched if not exceeded the low noise production of both, the Noctua NH-D15 heatpipe tower CPU cooler has to receive the Bigbruin.com "Recommended" and "Whisper Quiet" awards."
Richard Jackson - Big Bruin.
Noctua NH-D15 CPU cooler review by Big Bruin - Introduction & Conclusion.