The best Be quiet fan with various, do not even bother with pure, light, shadow wings. There are points where it is better than the Noctua A15, such as its cable and speed adjustment. Also, finally a motor that is smooth and when you turn it by hand, you can see that it does not have large gaps. Better than the Noctua F S series and one click below the best of all, the Noctua A. It does make noise compared to all the other Be quiet fans, but at the same speeds (700-800), I control them through the BIOS, the pure, shadow wing fans produce half the pressure. The Noctua sounds the same at speeds of 800-1000 respectively.

Heavy, powerful, good construction, not silent - if you see the motor, it is quite larger in size than version 3, and it has more blades.

This new version has a switch to adjust how many revolutions it turns at maximum.

The airflow is incredible at medium and maximum scale - but the noise is the same.

Its construction is really sturdy, very good, very heavy - and they also provide 3 different angles.

The disadvantages are the point where the cable comes out, it cannot go right or left without causing inconvenience, and now it makes noise if you put it at high speed above 1200 rpm.

I replaced all the fans with these and I am testing to see if I can adjust them in such a way that the noise does not bother me - that is, at low speeds and only if necessary at high speeds.

It comes in 120 and 140 sizes - they are approximately the same.