Scythe GentleTyphoon 4250 D1225C12B9AP-30 Test and Review

So what is Gentle Typhoon?

Gentle Typhoon is actually a 120mm fans series in the Scythe portfolio manufactured by Nidec Servo Corporation (Japan) made to provide very high rotating speed combined with very serious airflow, while working at low or average noise level. Apart from that the models from this series are separated in two sub-series:

GentleTyphoon 120 mm Fan Series:

  1. D1225C12B1AP-11 – working at 500 revolutions per minute and offering airflow level of 31 m³/h at only 5 dBA
  2. D1225C12B2AP-12 – working at 800 revolutions per minute and offering airflow level of 48 m³/h at only 9 dBA
  3. D1225C12B3AP-13 – working at 1150 revolutions per minute and offering airflow level of 63 m³/h at only 16 dBA
  4. D1225C12B4AP-14 – working at 1450 revolutions per minute and offering airflow level of 78 m³/h at only 21 dBA
  5. D1225C12B5AP-15 – working at 1850 revolutions per minute and offering airflow level of 98 m³/h at only 28 dBA

All five models together cover the silent to high performance range.

GentleTyphoon 120 mm High Speed Fan Series:

  1. D1225C12B7AP-29 – working at 3000 revolutions per minute and offering airflow level of 141 m³/h at only 36.5 dBA
  2. D1225C12B9AP-30 – working at 4250 revolutions per minute and offering airflow level of 198 m³/h at only 44 dBA
  3. D1225C12BBAP-31 – working at 5400 revolutions per minute and offering airflow level of 255 m³/h at only 50.5 dBA

The three models together are made entirely for pure and brute performance.

All of the models in both sub-series are made with Nidec Servo motors and are meant to provide performance, which is as high as possible for as long as possible.

I already tested the 1850rpm model from the GentleTyphoon 120 mm Fan and now is the time to check how the 4250rpm model from the GentleTyphoon 120 mm High Speed Fan Series performs.

Let’s get started…


GentleTyphoon 4250 was provided to me for doing a test and review directly from Scythe and arrived in the pretty standard for the company package, which is made of a transparent plastic box through which we can see the full fan structure and a carton cover hiding the additional accessories provided with the fan.

On the front part of the plastic box there are two very important things which I’ve decided to point out:

  1. a sticker with a warning information in six different languages since the fan is operating at very high revolutions per minute and if somebody is not careful enough a serious injury may occur.
  2. on the top side of the front part of the carton cover there are some details regarding the product and its performance


Of course, the full technical specification for the product is on the back side of the carton cover written in 6 different languages. As usual…

I still remember how good the 1850 version performed and for that reason I was really eager to check the fan itself.


As every other fan on the market, Scythe GentleTyphoon 4250 is made of three components:

1. A standard-dimension, painted in black matte square 120 x 120 x 25mm frame with overall weight of 205 grams with a bit thicker plastic so it can resist the rotation speed of the motor and kill any vibrations. The frame is meant to be installed on a 120mm case fan slot or CPU cooler with standard 120mm holes.


2.  The fan itself features a very large fan motor with double ball bearing made for as less as possible variations of the rotation torque and is installed to the frame with a vibration absorbing structure to reduce the noise level and kill any vibrations. The engine rotor is made with a metal plate for the propeller to be attached.

3. The propeller itself features 7 very wide, completely painted in black matte blades with very sharp angle, made to provide higher airflow and static pressure level, unfortunately at the expense of noise. Since the propeller is made to rotate at 4250 revolutions per minute, it is designed with integrated stabilizing ring to keep the blades rotating without bending due to the high speed and focusing the airflow.

The fan is powered by 300mm cable with 4-Pin Molex Connector with additional 3-Pin Fan Speed Signal Connector for observing the revolutions when the signal connector is linked with the motherboard. According to Scythe this fan should be powered only directly from the power supply or with very powerful fan controller since it drains about ~ 7W and may be risky for some motherboards.


The standard package for Scythe GentleTyphoon 4250 D1225C12B9AP-30 is a bit modest and features only 4 metal screws.

Now let’s do some testing

The tests will be conducted in my standard way. I will mount the fan and test it at 5V/7V/9V/12V and my goal will be to check the performance of the fan in real conditions. 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.

To do all 4 tests I had to modify the powering and regulating method because as it was I was able  to measure the revolutions per minute but not to control the fan and the voltage I need from my fan controller. So I added a 3 pin fan connector and now let’s check out how the fan performs.

And this is what the fan looks like installed on my test stand:


The test results are shown in the following charts:

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

Scythe GT 4250 D1225C12B9AP-30 A

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

Scythe GT 4250 D1225C12B9AP-30 R

The anemometer showed the following air speed:

Scythe GT 4250 D1225C12B9AP-30 S

As always, 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 Scythe GentleTyphoon 4250 D1225C12B9AP-30  made one full revolution at 6.5V and to conduct the first test I had to decrease the voltage to 5V. Unfortunately, after some attempts the fan was not able to operate at voltage lower than 6.5V.

Test at 5V:

In the first test, the fan was not able to operate at 5V.

Test at 7V:

In the second test conducted at 7V Scythe GentleTyphoon 4250 was rotating in a stable way at 2745 revolutions per minute, providing a serious airflow level of 157.92 cubic metres per hour and generating a lot of noise.

Test at 9V:

At the third test conducted at 9V the fan increased its speed up to stable 3510 revolutions per minute with airflow level of 201.12 revolutions per minute. The noise level increased.

Test at 12V:

The last test done at 12V made the fan to reach its maximum performance with airflow level of 244.8 cubic metres per hour and rotating at 4260 revolutions per minute. The noise level increased a lot and the fan could be heard from the other room.



Performance: After I finished testing all I can say is: Great job Scythe!

Scythe GentleTyphoon 4250 D1225C12B9AP-30 is clearly a fan made to provide absolute and brute performance for those people who actually need it. In fact this is the model with the highest performance from all those fans which I’ve tested for the last 3 years and the one holding the record for performance at my 120mm fans catalogue. I was really excited when I was doing the test at 7V and wondering what it has to offer at 12V and at maximum speed the fan was a serious airflow beast, which could be a bit dangerous, if not used with caution.

Of course, at all tests Scythe GentleTyphoon 4250 D1225C12B9AP-30 was noisy, a lot, but still this model is made to provide high airflow and static pressure level where and when needed. For quiet operation, Scythe made models working at lower revolutions per minute.

I can recommend this model to be used with CPU coolers installed on seriously overclocked processors and I can’t say it will be a wise choice to be used as a case fan since it is pretty loud even on the lowest speed.


Scythe GentleTyphoon 4250 D1225C12B9AP-30 is a good looking fan with very aggressive design combined with a pure black colour scheme which can make it stay neutral when installed in every modern case or attached to a CPU cooler.

I think Scythe GentleTyphoon 4250 D1225C12B9AP-30 deserves the following reward:


Scythe GentleTyphoon 4250 D1225C12B9AP-30 has been added to the 120mm fans catalogue.

Official price (MSRP): Scythe GentleTyphoon 4250 D1225C12B9AP-30 – 18.99 euro

Warranty: 24 months


I thank Scythe 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. Reply Dk_vr 22.05.2014 at 7:34

    Hello and thanks for the really useful information.
    Anyway I hope you understand that the majority of the people reading don’t have the experience and skills to do such a modification and if I released such an information some people may broke their fans trying to do it.

    Thanks for the link to the article how to mod the fan.

    Best Regards

    P.s. There is no point to hide a link to I am accepting all information that is useful. After all DVTests is a web page made to provide good and useful information to the regular users.

  2. Reply Newbie222 22.05.2014 at 3:55

    You should have mentioned that this model and the lower one (3000rpm) can be PWM modded, which brings them to around 2100rpm at lowest and are great for radiators. All is needed – to solder extra wire – just check under the fan label. There is a topic about it on already

  3. Reply Dk_vr 16.06.2013 at 15:10

    Well it is very risky to play with this fan if a safety grill is not installed. In fact there was almost no vibrations on the model . The balancing ring do the job right 🙂

    Hell yea. It is a model to cool everything just by brute force made of tons of air and noise 🙂

    I can say this model has it’s specific purpose.

  4. Reply PepiX 13.06.2013 at 16:10

    Wow.. who managed to name that beast ‘Gentle’? Serious power.. for brutal workhorses it seems.. It would be interesting to see someone making an extreme overclock performance comparison..

  5. Reply Boskorp 09.06.2013 at 20:03

    Better watch your fingers with this bully 🙂 Looks really great and the static pressure – wow. I assume all that rpm and noise comes with a lot of vibrations as well and those metal screws … at least some rubber would be better. Anything said “brute performance” is exactly what it is.

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