BeQuiet! revealed Silent Wings (Pro) 4’s airflow and static pressure

We know the official parameters of Silent Wings (Pro) 4. Larger models with a question mark

We finally have something to grab onto. Although you still can’t buy Silent Wings 4 fans, BeQuiet! has now officially released them, complete with detailed specs. This is something we’re interested in, and get this: we already have a comparison with the Noctua NF-A12x25 as well. Admittedly it’s a tricky one and we’re basing it on what BeQuiet! claims, but to set the mood for the upcoming tests it’s better than nothing.

We have already informed you that a new generation of BeQuiet! Silent Wings (4 and Pro 4) fans is just around the corner. But last month, there was still no information that in any way pointed to efficiency figures. Looking at the design, it was obvious that it was going to be a top of the line fan, but we wouldn’t bet our bottom dollar that the Silent Wings (Pro) 4 would beat the Noctua NF-A12x25. BeQuiet!’s internal parameters claim, however, that it beats the Noctua fan handily. And especially when running on massive heatsinks and radiators of coolers.

Silent Wings 4 and Silent Wings Pro 4 in 120 mm format have a maximum speed of 1600 rpm and a stated airflow of 82,74 m3/h and static pressure of 1,79 mm H2O. We can’t confirm these parameters yet, but what we can do is set the Noctua NF-A12x25 PWM to the same speed and compare the results with each other.
The result? NF-A12x25 achieves 8.5 % lower airflow at the same (1600) speed (75,69 m3/h) and up to 17.4 % lower static pressure (1,48 mm H2O). In other words, with an airflow of 82.74 m3/h at static pressure of 1,79 H2O, specifications of BeQuiet! claim that their new Silent Wings 4 will have more performance under any circumstances.

BeQuiet! Silent Wings 4 (120 mm)

So the question remains whether at lower or higher noise levels and, more importantly, to what extent the parameters of BeQuiet! scale with reality. If we assume that the specs vs. reality coefficients are unchanged from Pure Wings 2 and Silent Wings 3, the Noctua NF-A12x25 will remain undefeated. That is, in terms of performance at the same, some lower noise level. The 2500 rpm Silent Wings 4 (model BL094) certainly beats the Noctua, but naturally at the cost of higher noise.

BeQuiet! has slower and faster variants on offer again (the slower one, with a max. of 1600 rpm, has the designation BL093). But this only applies to fans without the “Pro” attribute. These, as you already know from last time, have a three-stage switch that allows you to change speed ranges and in the maximum one, the 120 mm Silent Wings 4 is capped at up to 3000 rpm. At this speed, both an extremely high airflow (242,12 m3/h) and static pressure (5,31 mm H2O) are to be achieved. But it won’t be any fun without noise canceling headphones.

Either way, the 120 mm Silent Wings (Pro) 4s look good and we are considerably more concerned about the efficiency of the 140 mm. These have two fewer blades, and such a thinner rotor may indeed achieve higher flow at lower noise, due to the larger cross-section, but only in environments with very little environmental resistance. There will be a significantly greater airflow loss on a radiator due to the significantly lower static pressure than with 120 mm models. BeQuiet! makes no secret of it either, at just 5,3 % higher airflow (87,16 m3/h), they claim only half the static pressure of the smaller fan (0,92 mm H2O).

BeQuiet! Silent Wings 4 (140 mm)

It is possible that with larger fans, BeQuiet! counts on use in cases rather than on water cooler radiators. And perhaps ones that don’t have grilles or have them circular everywhere, non-restrictive. On standard, hexagonal ones, like what BeQuiet! used in current cases, the efficiency of a fan with low static pressure will drop significantly.

The 140 mm Silent Wings 4 also has two speed variants. The slower one (BL096) has a max. of 1100 rpm and the faster one (BL097) 1900 rpm. The latter is supposed to achieve an airflow of up to 226.31 m3/h and a static pressure of 2.36 mm H2O. There is only one variant with DC regulation, the slower one (BL095). This also applies to the 120 mm model.BeQuiet! has cancelled the high-speed models with linear control intergenerationally. This even for the “Pro” versions, which, in addition to the three-speed switch/speed limiter, include a set of interchangeable corners for mounting on liquid cooler radiators, and also have a more massive cable braid and a more solidly mounted connector.

It is also worth mentioning that the active and passive modes of Silent Wings (Pro) 4 fans switch at 20 % intensity and DC models start up from 5 V. It would be useful to know what speed this refers to. We don’t know that yet, but we’ll find out all about it, and in fairly short order. We will release the tests at the same time as the sales launch, on 19 July. Until then, the results are under information embargo.

English translation and edit by Jozef Dudáš


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