"Now we could review each fan individually but since they are all the same core design of fan we think viewing them as a series is most fruitful. What is clear from testing the Noctua NF-S12A fans is that there is a great deal of flexibility They offer a delicate balance between excellent performance and solid acoustics, the NF-S12A FLX, and solid performance and excellent acoustics, the NF-S12 ULN. While the NF-S12A PWM model combines both and allows you to choose which speed you want between 300 to 1200RPM via PWM controls."
Ryan Martin - eTeknix
Noctua NF-S12A fan series review by eTeknix - Introduction & Conclusion.
