![]() I know sometimes the fan comparison can be troublesome as swapping from a PWM to DC model along with being high-speed vs standard throws in far more variables than you were probably aware. If you want the best potential for silence and great performance, the Silent Wings 3 will give you the best we can offer at this moment in time. In order to evenly compare high speed to high speed, you would want to compare the two similarly spec model between the two sizes, and see the maximum RPM of the 120mm "high-speed PWM" fan would now be 2000, and hence based upon the design would also reach the 36dB(A) range. The 120mm you chose was a DC model (3-pin) standard speed (up to 1500RPM) more quiet-focused model. But despite its quiet design, this fan provides airflow of only 26.3 CFM / 44,45 m/h, which is lower than on the Noctua model. In other words, both are inaudible in an average PC case. Rated at 18.2 dBA at max RPM, the noise level is virtually the same as on the Noctua fan. I notice that the 140mm fan you showed was the "high-speed PWM" variant which has a higher maximum RPM capability and also a different noise profile. The be quiet Pure Wings 2 80mm is almost as quiet as the Noctua one. We do the same with Silent Wings 3, and etc to offer a variety of features (Size, PWM/DC, speed, and noise profiles) possible. There are many models in each fan series. What you are comparing, you are looking at very different models of fans, as you can see here: PURE WINGS 2 silent Fans for your PC from be quiet! I think there may be some confusion here.
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