One more thing about the zero airflow to close it out. As the airflow through the measuring system/tunnel increases, the static pressure naturally decreases. There is a hole through which air escapes, like in a balloon. When the balloon is punctured, the static pressure on the balloon walls is naturally lower. So if you were to measure the static pressure in a leaky system, you would measure lower values than advertised by the fan manufacturers in the specifications. I don’t want to discuss in detail why many authors come to different conclusions, but often you can see just rookie mistakes. Note for example Majors Geek, who in older videos reports much higher airflow for the same fans than in the measurements of later videos. I suppose that this is due to initially incorrect processing of the anemometer data and here we come to the Bernoulli equation again. Although they are very skilled when it comes to 3D printing and they can build great things, they still have some room for improvement, let’s say, in the actual testing of fans. The specifications of the be quiet! Silent Wings Pro 4 list a maximum speed of 1600 in M mode, 2500 in HS mode, and 3000 in UHS mode. The models in this review achieved a slightly lower RPM of about 1500 (M mode), about 2300 (HS mode), and 2750 (UHS mode). This is still within the usual +/- 10% range, but it is noticeable. Analysis of volume and performance 120 mm

And now we come to the second view, when you don’t measure the raw data of static pressure, but the airflow drop due to a realistic obstacle. In this case you are also concerned with what static pressure a fan has and what performance to expect in practice. A fan with a smaller airflow drop through a particular obstacle is likely to have a higher static pressure than one with a higher airflow drop. And these measurements also take into account how the obstacle changes the character of the sound. Moreover, you are no longer measuring in the unrealistic environment of zero airflow, but at the kind of environmental resistance that occurs in practice, in an ordinary computer. Of course, the resistance of the environment is also dependent on the configuration of the system fans and so on, but that is a topic that is not worth bothering you with at this time.

Best combined with

besides that I have B12-PS that indeed has a really nice sound profile of wings, possibly even better than A12x25, but the motor itself is really whizzy, honestly I’m not sure what were the speeds, but the motor is audible basically from the start and only fades out when the wings noise becomes a concern for me For the test of the be quiet! Silent Wings Pro 4 140 mm, the procedure is largely identical to the test of the smaller fans. However, the be quiet! Silent Loop 2 280 mm is used as the AIO, which is mounted on top in the case for space reasons. Unlike the comparison against other brands, however, we’ll take a look at the difference between it and the previous model, the be quiet! Silent Wings 3 High-Speed 140 mm. speed One thing that irks me about some testers (ignoring the shills and frauds) is that they continually focus on certain brands and models, and ignore the many other options out there, many of which are not cheap. That’s part of why I have fans from 82 different brands – 1 to 18 models per brand. Because I believe that PC fans are vastly overpriced, I am focusing on (almost exclusively) lower-cost fans, understanding that what may be expensive here might very well be cheap elsewhere, and vice versa. Later, I will add in the expensive fans, assuming I can afford to do so, although I’ll probably ignore any fan over a certain price. However, the 140 mm variant naturally has a larger outer cross-section by some 37% (i.e. the active one, with blades). Thanks to the larger blades, it achieves a higher air flow even at lower speeds, but the static pressure is already lower. The gaps between the blades are considerably larger than in the 120 mm model, where they (the gaps) are really cramped. In the case of the 140 mm fan, the relative distances, due to which the static pressure drops, between the individual blades are quite large. For longer blade lengths a higher airflow is achieved, but this is especially so in a non-restrictive environment which offers little resistance to the fan. This means that the airflow drops considerably faster due to the obstacle. The more complicated the obstacle is (in terms of constraints on the fan), the smaller the advantage of the 140 mm fan over the 120 mm variant.

It is worth noting here that even in a completely non-restrictive (i.e. unbraked) environment, the specified speed is short of 180–200 rpm (but we are still within the allowable tolerance of ± 10 %), which means that the claimed airflow achieved is practically spot-on, even with a small plus margin. This speed switch has the advantage that at lower speeds the PWM control doesn’t drive the speed too high, even on motherboards with more aggressive speed curves.I’m planning on finding a large radiator (in excess of 8″x8″) to simplify the matter. I am also considering cutting a viewing port in the wall and placing crepe paper to show the airflow, although I’m not sure if this is useful without a paper with a scale on it on the far side, nor am I sure where it would be best to place it and how much it’d distort the results. Do you have any thoughts or suggestions?

We are currently preparing a methodology to test external SSD boxes, which similarly won’t be sold by a brand and aren’t high margin items either. We consider it useful anyway, since tests of this type are missing on the Internet.

Awards

Once I understand better if this anemometer is accurate or not, I’ll update here. I’ve left Bonvoisin a question about the heat production. Please don’t ask me to judge individual YouTubers. Again, I don’t watch that many of them, but when I do come across something, I’m usually not at all comfortable with the fact that some things are allowed to happen, and what’s worse, that people adopt them as “truth”. The entire surface of the blades is characterized by grooves, which are typical for BeQuiet! and quite useful. In particular, they eliminate microturbulence at the intake, which would be considerably more intense on smooth blades and thus less air would flow through the rotor. Unlike older fans (including the Silent Wings 3), however, these grooves have a slightly shallower depth. This is probably to make the material “weaken” as little as possible in the thinner areas. Still, these are relatively long blades in relation to the width, which are also characterized by higher flexibility.