"Today’s technological advances have covered the entire gambit from hardware to software, and the cooling components have seen the advancements, as well. Many fan companies now offer highly efficient fans that cool incredibly well, but offer very little in the way of noise contribution from the system. I currently have some of the quietest running fans in my one computer case and on the heatsink, that if it weren’t for the case lighting, I would never know that they were on. These wonderful fans happen to come from a common name in computer cooling, Noctua.
The Noctua NF-S12B 120mm fans are designed with noise control in mind. The Noctua NF-S12B fans can be run in three different fan speeds for performance versus noise, depending on your application. The included jumpers allow for fan speed selection to fine tune the performance, while keeping acoustical contributions in mind."