SilverStone FN121-BL review

The fan arrived to me in a very simple and still a bit stylish carton box with a few details for the product on the front side and the full technical details on the black side of the black painted box. From the view I am sure that everybody can guess I will talk about a 120mm fans with a beautiful blue backlight.

Right after I took the fan out of the package the first thing to notice was the design of the fan. It is interesting because this model offers very similar structure to SilverStone FM121 which I tested a few weeks ago and made  a performance record for my catalogue. So here we have a plastic transparent square frame with 4 blue LEDs attached with sillicone on every side of the 120mm frame and a matt semi transparent propeller with 9 blades with a really aggresive angle.

And this is how the LEDs look like.

As soon as I saw the propeller shape I was like – hmm should I expect the same performance as SilverStone FM121? For now I can’t say that but a bit later I will.

As you can see from the picture above, the whole fan is transparent if I don’t count the stickers on the front and on the back side.

The fan is powered and regulated by a long 3-pin cable, which is not sleeved and a 3-pin connector.

The standard package offers:

  1. Four metal screws for mounting the fan
  2. A 4-pin molex to 3-pin fan connector for powering the fan directly from the power supply

So, let’s do some tests:

The tests will be conducted in my standard way. I will mount the sample and test it at 5V/7V/9V/12V and my goal will be to check the authenticity of the technical characteristics given by the manufacturer. The product will be tested under close-to-perfect conditions, not taking into account any external factors. The results achieved during the test can in no way be the same if the fan is mounted on a cooler or on the case fan hole of any modern computer case. I will measure the amount of air going through the fan for one hour and its speed. For this I use a fan controller, a voltage meter, an anemometer and a stand made specifically for this purpose.

The test results are shown in the following charts:

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


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

The anemometer showed the following air speed:


After mounting the fan onto the stand and leaving it to run for about 30 minutes at maximum speed, it was time for the tests to begin.

As with my other tests, again I started with a gradual increase of the voltage through the Lamptron FCT starting at 0V and the SilverStone FN121-BL  made one full revolution at exactly 5V, while the LEDs powered at 3V but it was blinking and very low. Of course with increasing the voltage the backlight was getting better and more stable.

Test at 5V:

At the first test the fan was rotating at only 600 revolutions per minute with airflow level of 45.6 cubic metres per hour. At these revolutions per minute the fan was absolutely silent.

Test at 7V:

At the second test the fan reached 840 revolutions per minute with airflow level of 64.8 cubic metres per hour. Again the fan was absolutely silent.

Test at 9V:

The third test was conducted at 9V and the fan reached 1035 revolutions per minute with airflow level of 84.48 cubic metres per hour. At this test there was a  noise coming from the engine of the fan but was not possible to hear it from a distance bigger than 10cm.

Test at 12V:

The last test was conducted at 12V and at this voltage the fan reached its maximum performance. SilverStone FN121-BL was rotating at 1305 revolutions per minute with airflow level of 104.64 cubic metres per hour. The noise from the engine increased.


  1. Performance: After I am done testing all I can say is this fan offers quite a good airflow and it can be installed as a case fan and as a cpu cooling fan. I believe it can handle with the job as a fan mounted on a CPU cooler, cooling a processor at default or a bit overclocked but not extremely overclocked. Even if it is with a very aggresively shaped propeller, still the airflow level and static pressure are not so high. And because of that, I can say that the purpose for this model is to work as a case fan supporting the airflow inside every case.
  2. Noise level: The fan was quiet at 5V and 7V but there was a strange noise from the engine at 9V and 12V. Apart from that, there was a tiny noise from the air passing through the propeller.
  3. Apperance:  At first sight this model looks very similar to SilverStone FM121 but it is totally different as performance. The transparent frame and semi transparent propeller combined with the blue LEDs backlight are a really nice feature that can make any case very, very shiny.

As a disadvantage I can meantion the lack of PWM and the lack of LEDs ON/OFF switch because at 12V they are really bright.

I think SilverStone FN121-BL 1 deserves the following reward:

SilverStone FN121-BL  have been added to the 120mm fans catalogue.

Official price (MSRP)unknown

Warranty: unknown

I thank Silverstone for the test sample.

Dobrin Krastev is the owner, reviewer and newsman of 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.
1 Comment
  1. Reply Shad0whunter 25.11.2012 at 13:34

    I am really a big fan of Silverstone. I own a larger fan as a case fan and it has outstanding performance like this one in the review.

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