Overclockers Online has posted a new review on the Noctua NF-P12 120mm Fan

The Noctua NF-P12 is a great fan. Its combination of good performance with low noise seals the deal. Noctua has delivered on their company motto of producing "sound-optimised premium components" - this fan is almost silent when used with the included ultra low noise adaptor. In fact, it was near silent without even using any of the adaptors! This may be due to the unique "vortex-control notches" on the fan blades which apparently spread the noise spectrum of the fan out over a wide range to make it sound less noisy.

Noctua NF-P12 120mm Fan Review