Be Quiet Silent Wings 2 120mm PWM and 140mm PWM – Test and Review

As a relatively new company be quiet!, already offers several fan series: Silent Wings 2, Shadow Wings and Pure Wings, which includes a wide range of models with dimensions from 80 up to 140mm with 3-pin or with 4-pin PWM regulation. I’ve already tested some products in the past, which currently are at end of life state and for that reason I am pretty excited to test fans from the Silent Wings 2 series.

For this test and review I received Be Quiet Silent Wings 2 120mm PWM and Be Quiet Silent Wings 2 140mm PWM. Premium products, which arrived inside amazing looking packages with some major details together with big pictures of the products themselves on the front panels.

Silent Wings 2 120mm PWM front view Silent Wings 2 140mm PWM front view
IMG_0377 IMG_0400

 

The packages themselves are made as a carton box painted entirely in black/grey colour scheme with a front flap covering a transparent see through cut, through which the structure of the fans can be seen. Also when the front flap is lifted there are tons of details regarding the products and the technologies used so these fans can be created.

SW 2 120mm PWM technical details SW 2 140mm PWM technical details
IMG_0382 IMG_0402

 

Apart from that, just above the fans inside the packages there are 2 additional compartments for the mounting accessories. All of the technical details regarding the fans are explained in several languages on the back side of the boxes.

So let’s continue the article with checking out the fans’ structure…

 

Be Quiet Silent Wings 2 120mm and 140mm STRUCTURE

As part of the Silent Wings 2 series, the two fans are designed with identical structure with only one difference and that are the dimensions.

So let’s pay attention to the fan structure.

IMG_0384

Both of the fans are equipped with a square, entirely painted in black plastic frame with dimensions of 120 x 25 for the smaller version and 140 x 25mm for the big Silent Wings 2 brother. The frames are actually formed as one plastic plate with 4 cuts in each corner so the mounting brackets can be attached and the fans can be installed to case fan slots. The plate itself includes a circle around the propellers, which makes the overall 25mm thickness of the frames. The body of the fans looks not so strong but overall the plastic is pretty thick, solid and really rigid.

IMG_0387

Apart from the pretty solid frame, both of the fans are equipped with pretty massive and very aggressively looking propellers. Be Quiet Silent Wings 2 120mm PWM is equipped with an entirely painted in black propeller with 7 very wide and not very sharply angled blades, while the big brother in the series Be Quiet Silent Wings 2 140mm PWM offers 9 pretty narrow and very sharply angled blades. Both of the propellers are designed with the company’s unique airflow-optimized fan blade design, which reduces the noise-generating fan turbulence. Of course, both of the propellers are entirely ribbed to deliver more focused and stable airflow.

The connection between the frames and the propellers for both of the products is done via 4-pole fan motors, which includes Fluid Dynamic Bearings with copper cores made to transfer heat away from the bearings more effectively to deliver super-long fan life of up to 300,000 hours constant operation. The bearings themselves include industrial grade lubricant, which eliminates the direct contact between the rotors and the frames and further resulting in extremely low noise levels operation.

With these motors the fans are able to operate and provide:

  • Be Quiet Silent Wings 2 120mm PWM is made to operate at maximum 1500 revolutions per minute, delivering airflow level of 85.8 cubic metres per hour, static pressure level of 1.63mm H2O at noise level of 16.5dBA.
  • Be Quiet Silent Wings 2 140mm PWM is made to operate at maximum 1000 revolutions per minute, delivering airflow level of 102.6 cubic metres per hour, static pressure level of 0.81mm H2O at noise level of 16.4dBA.

Both of the fans are made to be powered and regulated via pretty long 450mm entirely sleeved in black mesh 4-pin PWM cables and connectors.

 

Be Quiet Silent Wings 2 120mm and 140mm ADDITIONAL ACCESSORIES

After checking the structure of the fans I believe it is time to check the additional accessories included in the packages.

SW 2 120mm PWM accessories SW 2 140mm PWM accessories
 IMG_0389  IMG_0404

 

Being a premium fan part of the Silent Wings 2 series it requires to provide very good cooling performance with a lot of options and to do so a various set of accessories will be required. For that reason both of the fans are equipped with identical accessories packs, which includes:

  1. 5 x entirely painted in black screws
  2. 5 x entirely painted in black push pins
  3. 5 x entirely painted in black silica gels acting as rubber dampers
  4. 4 x rubber mountings brackets
  5. 4 x plastic mounting brackets

I believe before installing the fans and perform some tests it will be nice to show how the mounting brackets should be installed.

IMG_0392

To install both of the fans to a case fan slot of every modern case, the guys from be quiet! predicted two possible ways.

SW 2 120mm PWM Push pins SW 2 140mm PWM Push pins
IMG_0393
 IMG_0406

 

The first one is actually a bit more complicated, which includes adding to each corner of the fan 4 hard plastic brackets, 4 rubber dampers, attaching the fan to the case fan slot and then secure it with the 4 black push pins through the metal of the case.

The second method is let’s say pretty standard.

IMG_0395

It requires the 4 rubber brackets to be attached to each corner of the fans, add them to the case fan slots and secure them by fastening 4 metal screws using a Philips screwdriver.

SW 2 120mm PWM metal screws SW 2 140mm PWM metal screws
IMG_0397
IMG_0407

 

Definitely both of the methods will deliver solid connection between the fans and the case and will guarantee less vibrations and noise, which will be reduced by the rubber dampers.

Now let’s mount the fans on my test stand and check their actual performance.

Be Quiet Silent Wings 2 120mm and 140mm TESTS

The tests will be conducted in my standard way. I will install the fans and test them at 5V/7V/9V/12V and my goal will be to check the performance of the products in real conditions. They will be tested under close-to-perfect conditions, not taking into account any external factors. The results achieved during the tests can in no way be the same if the models are mounted on a cooler or on the case fan slot of any modern computer case. I will measure the amount of air going through the fans for one hour and their speed. For this I use a fan controller, a voltage meter, an anemometer and a stand made specifically for this purpose.

And this is what the fans look like installed on my test stand:

IMG_0526

The test results are shown in the following charts:

Airflow through the fans at 5V, 7V, 9V, 12V

Be Quiet Silent Wings 2 120mm and 140mm A

Propellers rpm during the tests at 5V, 7V, 9V, 12V.

Be Quiet Silent Wings 2 120mm and 140mm R

The anemometer showed the following air speed passing through the propellers:

Be Quiet Silent Wings 2 120mm and 140mm S

After mounting the fans onto the stand, and leaving them to rotate for about 30 minutes at maximum speed, it was time to do the tests.

As with my other tests, again I started with a gradual increase of the voltage through the Lamptron FCT starting at 0V and since both of the fans have identical motor they made at least one full revolution of up to 6.5V. To do my tests I had to flatten the operation voltage for both of the fans at 5V and check their performance.

Test at 5V:

At the first test conducted at exactly 5V, Be Quiet Silent Wings 2 120mm PWM was rotating at 480 revolutions per minute, delivering airflow level of 22.56 cubic meters per hour, while Be Quiet Silent Wings 2 140mm PWM was providing airflow level of 15.84 cubic meters per hour, while rotating at only 270 revolutions per minute. Through this test I can’t really speak for noise. Both of the fans were dead quiet.

Test at 7V:

At the second test conducted at exactly 7V, Be Quiet Silent Wings 2 120mm PWM was providing airflow level of 33.12 cubic meters per hour, while rotating at exactly 600 revolutions per minute, while Be Quiet Silent Wings 2 140mm PWM was providing 24.48 cubic meters per hour, while rotating at only 330 revolutions per minute. At this test both of the fans remained absolutely noiseless.

Test at 9V:

The third test conducted at 9V, showed that Be Quiet Silent Wings 2 120mm PWM was rotating at 1170 revolutions per minute providing airflow level of 67.68 cubic meters per hour, while Be Quiet Silent Wings 2 140mm PWM was providing 60.96 cubic meters per hour, while rotating at only 705 revolutions per minute. At this test both of the fans started showing some serious cooling performance but remained absolutely quiet.

Test at 12V:

At the last test conducted at 12V, both fans reached their maximum performance, which for Be Quiet Silent Wings 2 120mm PWM was airflow level of 90.24 cubic meters per hour at 1545 revolutions per minute, while for Be Quiet Silent Wings 2 140mm PWM it was 90.72 cubic meters per hour, while rotating again at only 1005 revolutions per minute. Both of the fans started generating a very tiny noise, which was coming from the air passing through the propellers.

After I am done checking the structure of the fans and most of all their performance I believe it is time to express my thoughts regarding the products.

 

Be Quiet Silent Wings 2 120mm and 140mm CONCLUSIONS

1. be quiet! Silent Wings 2 120mm PWM and 140mm PWM Performance:

I spent some time checking the fans structure and having fun with their features and performance capabilities and I could say that definitely both of the fans should be counted as premium products.

Both of the fans offer pretty solid structure combined with a wide range of very interesting high tech features, which will definitely deliver and guarantee stable, quiet and most of all reliable cooling performance for a very long period of time.

All of the technologies used together so these products can be created are combined with one purpose only and that is to deliver pretty good cooling capabilities when the fans are installed on a case fan slots to boost the overall airflow inside every modern case and keep all of the hardware inside working cool, stable and quiet. And that is confirmed with the pretty high starting voltage, the big performance jump at the 9V test and the very low noise level even at full speed. I can’t really recommend any of these models to be used as a main fan for a CPU cooler or cooling radiator of water cooling system just because of the overall pretty low static pressure, which both of the fans are able to deliver.

Overall through all of the tests both of the fans were absolutely quiet and were able to provide pretty decent airflow through the tests at 9V and 12V.

 

2. be quiet! Silent Wings 2 120mm PWM and 140mm PWM Appearance:

In matter of appearance, I’d rather say that I am really, really impressed. Both of the products somehow unite very stylish in the face of the frame and at the same time pretty aggressive design in the face of the propeller. Together they form outstanding appearance in black matte, which will stay neutral inside every modern case and at the same time will definitely catch the look of every curious eye close to the system. I should say – pretty good job, be quiet!

I think that Be Quiet Silent Wings 2 120mm PWM deserves the following reward:

Best-Perf-Visual

while Be Quiet Silent Wings 2 140mm PWM deserves the following reward:

Most-Silent

Be Quiet Silent Wings 2 120mm PWM has been added to the 120mm fans catalogue.

Be Quiet Silent Wings 2 140mm PWM has been added to the 140mm fans catalogue.

Official price (MSRP): Be Quiet Silent Wings 2 120mm – unknown

Official price (MSRP): Be Quiet Silent Wings 2 140mm – unknown

Warranty: 36 months

I thank be quiet! for the test samples.


Be Quiet Silent Wings 2 120mm PWM and 140mm PWM – Test and Review
9.3 Total Score
Extreme quiet operation combined with amazing appearance

Performance
8
Noise Level
10
Additional accessories
10
Appearance
10
User Rating: 4.53 (4 votes)

Dobrin Krastev is the owner, reviewer and newsman of www.DVTests.com with more than 15 years' experience in personal computers, server and storage systems, UPS, peripheral devices and software. Passionate about testing and reviewing, AMD overclocking using AM3 990FXA and AMD FM2 A85X test systems and building modding projects.
2 Comments
  1. Reply Martin 05.11.2017 at 20:43

    You built this fancy-schmancy test rig, measured operating voltages, RPM, and CFM… Over the course of a 1 hour sampling.

    You chart and present the results.

    The products name is “BeQuiet!”

    Did the thought ever occur to you to actually measure actual noise in decibels?

    Versus woefully inaccurate and subjective perception?

    What an oversight.

    • Reply Dk_vr 06.11.2017 at 10:23

      Hello Martin,

      Thank you for your opinion…

      Yes, I had some plans to perform some noise measurements but to provide real and accurate results I should have:

      1. Clean room – especially designed and noise isolated room
      2. Very precise measurement equipment

      Both of these are not achievable since the whole web page is just a hobby for me and my friend.

      Anyway may I ask what is the actual issue here?

      Best Regards

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