![]() To their credit, Corsair's published numbers are fair and generally hold up in comparison with other manufacturer's published information. You can try and compare between manufactures, but many are less than straightforward with their "methods". Real life readings will always be substantially different and more often than not, the pitch makes all the difference rather than the actual sound pressure levels. You can't test on your own an compare to the specs, unless you turn the spare bedroom into an anechoic chamber. Performance at 12V: Performance at 12V: Airflow: 52.19 CFM: 66.4 CFM: Static Pressure.75 mmH20.80 mmH20: Sound Level: 25. Air Series AF120 LED White Quiet Edition High Airflow 120mm Fan - Twin Pack. the 4000D is a fitting choice for an immaculate high-performance PC.Maximum PSU Length : 220. CORSAIR Air Series LED high airflow PC case fans combine efficient, low-noise airflow with striking LED lighting. It's hard to make much sense out the manufacturer noise specifications. Buy CORSAIR 4000D AIRFLOW Tempered Glass Mid-Tower ATX Case - High-Airflow - Cable Management System - Spacious Interior - Two Included 120 mm Fans. Sometimes a particular fan blade and case just don't go together well. Before you do, see if you can hook up one of the fans to a speed controlled header to simulate the 12/9/7V speed for the Quiet Edition. If you have the option to exchange, you might want to pursue it. Normally, I would not recommend the Quiet Editions over the Performance, but no speed control would be the exception. Most everything is noticeable above 1000. AF120 Performance Edition Airflow Fan Three colored rings in red, blue, and white. ![]() I don't know of any 120mm fan that is truly quiet at that speed. Air Series AF120 Performance Edition: Size: 120mm x 25mm: Connector: 3-pin Fan Connector: Bearing: Hydraulic: RPM: 1650 RPM: AirFlow. Unfortunately, I think the answer is you're just spinning too fast. Bearing vibrations (some extreme one) You can even fell if the fan is in Your hand (nothing is perfect, can be some faulty one (s) ). I can´t help You more here, just as I wrote, test a fan when standing on a desk (on a rubber or some soft material) kick it in to 12V and measure the noise level. At idle state or standard gaming load the system is quiet (up to 30-35 dBA), all fans are controlled through the CPU coolers PWM signal. But as I wrote before, my Noctua fans in my really sound dampened Fractal Design R5 case are making also lot of noise when the system get serious load (my 980Ti heats like hell when overclocked and loaded) but I was considering this when I installed the 3x140mm and 4x120mm fans. You are already using speed reduction (7V or 9V) so I´m affraid it will be not better. Have You tried to measure the noise of the fans when these are not mounted into Your case ? Your case has lot of vent holes, no sound dampening material and the construction is from let´s say thin steel material so it´s not blocking to much noise, and also these fans on full 12V are moving lot of air, so it causes more noise. Yes, the rubber corner mount is ok and enough.
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