ASE Labs posted a review on the Noctua NF-S12 Fan
A quote from the article:
>> Noctua NF-S12 Fan Review
While most people reading ASE Labs as well as other enthusiast publications are very concerned with heat, there is another niche that is concerned with sound. Selecting a fan to provide adequate cooling that is quiet is really a shot in the dark. The fan rating may say one thing, but in practice it means something completely different. Noctua steps forward to provide a fan that satisfy the cool and quiet needs of enthusiasts.
>> Noctua NF-S12 Fan Review