"When we look at the broad picture, Noctua seems to know CPU cooling well, both big and small. The Noctua NH-U9S is again a similar story, demonstrating excellent build quality and aesthetics. All of the design choices were optimized for a low noise and high performance balance, and it shows in our tests. As for performance, much like the ukulele, the NH-U9S is very capable when considering its size, and performs on par with what we expect."
Aaron Lai - APH Networks.
Noctua NH-U9S cooler review by APH Networks - Introduction & Conclusion.