DV Hardware published a review of Noctua's silent 80mm and 120mm fans

Case fans come in lots of sizes and varieties. Today I'm taking a look at two case fans from Noctua. While some fans are designed to be as flashy as possible, these fans from Noctua were engineered to be as quiet as possible. Some of you may already be familiar with Noctua, they recently launched a couple of very successful silent processor coolers but they also have case fans and chipset coolers. Noctua is an European company, they have their headquarters in Austria and they work closely together with the Austrian Institute of Heat Transmission and Fan Technology to develop high-end sound-optimised cooling products.

Noctua NF-S12 and NF-R8 fan Review