Review on Noctua NF-A14 iPPC-2000 PWM 4-Pin Heavy Duty Cooling Fan – Ultimate Performance at 2000 RPM (140mm, Black) by Bill Dahl

Spins at over 2000 rpm, quiet even at maximum speed. Well built, always perfect out of the box. Many fans are great, but none of them can compete with the Noctua 120mm. Yes they are more expensive, yes they are hard to find in different sizes. You get what you pay for and for overclockers they are just as important as your primary cooling solution, be it AIO or open loop. The accuracy is also very well reproducible. If you adjust the fan speed, it is in the range of about 10%.