Review on Noctua NF-P12 redux-1700 PWM: Optimized 4-Pin Cooling Fan for Exceptional Performance at 1700 RPM (120mm, Grey) by Gerardo Goodson

This product lives up to the many reviews it has. It is well made, very quiet and available in a variety of models that vary in features and size. Static pressure and airflow to name a few. I recommend all fans from Noctua. The downside is that they are expensive. Buying a pair pretty much takes care of that $50 bill burning in your pocket. I would recommend them if you have a need, but I will also recommend some of these that will also get the job done but come in packs of 2, 3 and even 4, sometimes half the price. I found some that weren't over the top, but were quiet, simple, and reliable. For my newly built and expensive processor I went with one of these to ensure I had RPM performance and smoothness beyond what is likely to be needed so it was a good choice. At 1500 rpm it makes noise, not quiet, but not loud either. It is tolerable and pushes good airflow.