In fact, the fans shut down at 4.2 V and turned back on at 4.3 V so the claim of these fans having a low re-starting voltage is true. Max RPM was 974 at 12 V and both fans went down to 322 RPM at 4.3 V before shutting down. But at this point, I will still suggest sticking with the voltage control versions unless you are aware of these potential, and I have to stress potential here as your motherboard PWM control setup may work just fine, control issues and want to go ahead. That looks so much better, doesnвЂ™t it? I am not an electrical engineer by trade nor will I pretend to understand exactly what is going on, it is for be quiet! to do so. Thanks a lot to community member Darlene and her вЂњDiva AdapterвЂќ I was able to test these fans again with an external pull-up logic in place and guess what happened? This can be remedied if you are handy with electronics and electrical engineering, or simply know someone who does. The situation is still unclear at this point, but what is clear is this: some PWM controllers and the be quiet! Silent Wings 3 PWM fans do not get along very well. Unfortunately, this PWM control issue wherein there is a massive drop in fan RPM going from 100% PWM duty cycle to even 99% PWM duty cycle on the Aquaero 6 is not new and it has been covered in more detail here. The fans were individually tested and the results below are averaged with a standard deviation calculated.ДЇirst up, I wanted to map out the RPM response curves to see if there was a significant difference between the fans controlled via PWM vs DC voltage control before measuring noise and airflow through the radiator. Fan noise was measured in an anechoic chamber of size 5вЂІ x 8вЂІ with ambient noise level ~19 dBA and a sound probe held 6вЂі away to measure the sound volume in dBA accordingly. Linear airflow was measured using an Extech 45158 Thermo-Anemometer 6вЂі away from the fan such that it measured the airflow in feet per minute through the radiator. Testing was done with the fan mounted one at a time on a single Swiftech MCR140QP radiator in a push configuration, with the fans controlled using a dedicated fan controller (Aquacomputer Aquaero 6 XT) in PWM or power (DC voltage) mode depending on the fan used.

Be quiet silent wings fans