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However, the advantage of the Silent Wings Pro 4 also lies in other things than the radiator mounting kit. One of these is a more solid cable with a dense fabric braid. Similar to what you’d encounter with mouses or keyboards. In a spot where regular cables break, this one has an extra sturdy intermediate with the BeQuiet! logo. I have come to wonder if it would be best to just start publishing what results I have from the U12A testing I’ve done. I have testing in triplicate for the Noctua NF-A12x25, and the DeepCool FK120, and I’m almost done with the Akasa Vegas R7. Where the Silent Wings 4 finds more success is when it comes to pressure. The standard 120mm model manages 1.79 mm/H₂0 at 1,600 RPM, but up to 3.86 mm/H₂0 at full speed. That makes it a great fit for radiators, and up there with the likes of Corsair's SP120 static pressure fans at 1.45 mm/H₂0 at 1,400 RPM. The Noctua NF-S12B isn't the fan you'd want for this purpose at 1.31 mm/H₂0 at 1,200 RPM, instead you'd be better off with something like the NF-P12 redux. The “radiator” corners have both wider and taller arms, which make them fit better with the outer arc of the rotor tunnel. Compared to other types, it seals off any gaps and thus no longer causes unwanted air leaks, which naturally increases the static pressure and thus also increases the overall cooling efficiency, which is also proven in our tests. The radiator corners are pre-installed on the Silent Wings Pro 4, and it should be added that they are only included on fans with “Pro” in the designation. Regular Silent Wings 4’s do not have them and will perform less efficiently on radiators. Admittedly a bit unnecessary, but it’s because BeQuiet! wants to make the more expensive variant of the new fans more attractive. Compare both of those to the Noctua NF-S12B redux-1200 PWM, our favourite PC fan, at 100.6 m³/h at 1,200 RPM, and you're likely looking at running the Silent Wings at a higher RPM to match that airflow rate. But with the Silent Wings Pro 4 you really can crank up the RPM something fierce if you don't care for the noise.
Silent Wings 4 140mm combines all features of a virtually inaudible with an extremely performant fan. A 6-pol-motor and anti-vibration mountings combined with fan blades optimized for maximum airflow make Silent Wings 4 140mm the perfect choice for the most demanding applications in high-end systems. But then there is the acoustic aspect. But if bringing the leading edges closer to the trailing edges manifested itself most noticeably with a subtle increase in sound intensity around 2.5 kHz, always with a very faint hiss, then all is well and we can conclude that this compromise was worth it.All the secrets around the BeQuiet! Silent Wings (Pro) 4 are over and the detailed analyses of the sub-features begin. And it’s great that we can be a part of it. This is, after all, without a doubt, the biggest “cooling” event of the year, and it’s spicier than we thought. The new BeQuiet! fans may be the absolute top of the line, but they haven’t avoided certain imperfections that you have to take into account.
Today we are looking at be quiet’s new Silent Wings Pro 4 fans, a new product from be quiet that’s designed to be the company’s most “ progressive, performant and versatile” fans to date. These fans are optimised for use as case fans, radiator fans and heatsink fans, acting as the company’s best in class solution for all use cases. The build quality of the be quiet! Silent Wings Pro 4 passes the test. Where the quality of previous models was already very high, these models also offer very high quality for the price. The frame is torsionally stiff, the fan blades are robustly finished and the edges are all neatly finished. The cable sleeves are close, making the cable look narrower and less obtrusive. It also makes its width consistent throughout. They are also well-made and sit firmly on the frame without any wobbling. In short, the price and build quality are definitely on a premium level. Installation and exchange corners BeQuiet! has shrunk the gap between the ends of the blades and the frame between generations (from 1.2 to 1.0 mm), but it’s still twice the size of the Noctua NF-A12x25 fan that the Silent Wings Pro 4 will be unavoidably compared to. This, too, is a testament to the fact that the BeQuiet! is bluffing and knows that the blades do stretch a bit. As part of some bonus article later on, we’ll try to capture this for you in some macro photos, which show it well with the right lighting. 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 wouldn’t talk about what each tunnel must or must not contain. It depends on overall aerodynamics and how the fan is measured. For example, the flow straightener in some tunnels may be useful, in others it may not. Personally, I consider it an element that unnecessarily increases the resistance of the tunnel itself, which is undesirable for airflow measurement.
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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. There is also a disproportion in the ratio of tests of cheap things to expensive ones. You don’t have to go far for an explanation here either. The vast majority of tests are commercial ones and there are higher margins on the more expensive stuff, and that means more profit for the test author, because “there is something” to pay his fee from. When it is not done by the manufacturer’s representative himself in the context of paid advertising, there is also a commission model from the units sold in stores. And, of course, from the sale of a hundred pieces of expensive, 700-euro motherboards, there is more in margins than from a fivefold quantity of cheap, 120-euro boards. We know that this is the way it is, but those who are passionate about the professional side of things will be able to resist this temptation. I believe that we are a good example of this, because we often test very cheap things, whether it’s boards, fans or 3 euro SSD coolers and even relatively unknown… have you heard of the brand Axagon? It is possible that you have, but I assume that more people know Thermalright when it comes to SSD coolers. As for the actual corner types, the Silent Wings Pro 4 has up to three. Standard, anti-vibration and corners optimized to work more efficiently on liquid cooler radiators. These are the largest ones, pictured left. Compared to the other types, they increase static pressure on the radiators, and it’s not just a marketing phrase. 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 Meanwhile, to obtain better speed value with your methods, I suggest measuring at as many points as possible in one section area. Then, you’ll get v1, v2, v3, … , vn for each positions and can get the approximate average air speed along duct area, calculating v’=(v1+v2+v3+…+vn)/n. Of course, this can take more time to measure speeds than the options with larger vane.
On the other hand, applying am air cooler heatsink to a wind tunnel is very hard work. Placing thin aliminium fins(0.4~0.5T) with constant gaps(1.6~3.0mm) and cutting fins into proper size will be not easy things. Also, the side of heatsink and the connection between a heatsink and a tunnel should be sealed to prevent leakage of wind. I am thinking about how to easily make a heatsink for testing. Therein lies some of that flexibility that Be Quiet is talking about with the Silent Wings 4, and if you're the type to reuse fans for all manner of purposes over their lifetime, perhaps they're a better all-round fit than some individually. Though that also means they're perhaps not as good for each task as a more bespoke designed fan would be. I guess we have a misunderstanding. Static pressure is, of course, extremely important in fans. And even in the position of system fans (on grilles and dust filters), where its influence is often underestimated. I am only writing about two different approaches to analysing the static pressure in fans. We can talk about two different views.
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Building wind tunnel like Figure allows to get easily, and ∫dA should be area of a vane of an anemometer. So the air volume we want can be obtained by simply multiplying them: ∫vdA=∫dA=A While the measured values of air flow and static pressure can be confronted with the paper parameters of the manufacturers, this is not the case for the noise level. Here I measure completely differently, from a much shorter distance and even with a parabolic amplifier for more sensitive and higher resolution recording. The claim that even our quietest mode is too noisy is therefore, in my opinion, quite misleading. But again, I understand you have a very sensitive ear, but after your interpretation, another user will form a different picture of the noise of this or that fan as significantly noisier than it really is, I think. 🙂 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 For the test of the be quiet! Silent Wings Pro 4 120 mm and some comparison fans, the performance of the case fans was set to static low speeds. In addition, the AMD Ryzen 9 5950X was used for performance comparison, which draws around 120 W in the test system during the Allcore Cinebench run (4.25 Ghz at 1.15V). Here, the DeepCool LS720 is used as the AIO, which is installed in the front of the Fractal Design Pop XL Air. For measurement, the cooling system is heated up for 8 minutes and then the average temperature of one minute is measured. Lastly, the temperature delta is achieved, which is the temperature difference between the room temperature and the CPU temperature, so that the results are not distorted by fluctuations in the room temperature. Speed I also tried using S12A to improve airflow in the case, unfortunately this one was capped at around 400RPM basically moving no air at all (and certainly much less than A12x25 at 600RPM)
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. Sure, blade shape isn’t everything and a lot of things can always go wrong, but what direction fan geometry will take in the coming years is very predictable and understandable. There will be hints of who is copying who for some time to come, but with the gradual demise of traditional rotors, things will calm down and we’ll get used to the “new” ones as the standard. And let’s be glad for that, this is progress in the right direction and it’s just a matter of who can fine tune the small aerodynamic details more effectively. And now let’s break down what and in what quality BeQuiet! has managed to do with Silent Wings (Pro) 4. If you want to use a radiator as obstacle, you need to make the part connecting a radiator and wind tunnel. Using the actual radiator is recommended, because the result of straws bundle and a radiator can be different. The frame design of fan espeacially affects the efficiency for a radiator. Square frame shapes tend to be more efficient on a radiator. It would be nice to be able to reflect these differences in your test. You can easily find a cheap 120mm 1-row radiator on Aliexpress. The expensive Pro version is an investment in the future. With the high expected lifetime of 300,000 hours (= 12,500 days = 34 years of continuous operation), these fans can definitely outlive several computers and be used in very different places as needed. Thus, the costs are relatively high at once, but if you actually use the fans for years and don’t have to change them when upgrading the system, it can be worth it compared to buying several cheap fans. That being said, even the similar quality competition is not noticeably cheaper in price and if you use the regular models instead of the Pro variant of the be quiet! Silent Wings 4, you will actually come out cheaper. Conclusion In short, the previous or say traditional shape of axial rotors, can never outperform the state-of-the-art design that minimizes the relatively inefficient sideways airflow because of the airflow angle, which pushes a large part of the streamlines well off the axial direction of airflow. It’s inefficient because there is more friction between the frame and the blades and hence more noise, which reduces what we call efficiency (the ratio of airflow intensity to noise level).The symbols weren’t the problem – math is just difficult for me. What is the formula to calculate the area of a vane? A12x25 sitting in the case under my desk works fine at 600RPM, since I have only a single one of these can’t really talk about unit to unit variance, but I’m expecting these to have pretty consistent quality
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