Scythe Kaze Flex 120 SU1225FD12L-RD, SU1225FD12H-RP and SU1225FD12M-RHP – Test and Review

Scythe Kaze Flex is a brand new series, just added to the company portfolio, featuring five different 120mm models, made to cover every need of normal daily users, gamers or enthusiasts. The models in the series are:

  1. SU1225FD12L-RD working at 800 (±10%) revolutions per minute, providing airflow level of 43.03 CFM, static pressure level of 0.49 mmH²O at noise level of 14.5 dBA.
  2. SU1225FD12M-RH working at 1200 (±10%) revolutions per minute, providing airflow level of 51.17 CFM, static pressure level of 1.05 mmH²O at noise level of 24.9 dBA.
  3. SU1225FD12H-RP working at 2000 (±10%) revolutions per minute, providing airflow level of 89.04 CFM, static pressure level of 2.99 mmH²O at noise level of 38 dBA.
  4. SU1225FD12L-RDP PWM powered and regulated and working at 300 – 800 (±10%) revolutions per minute, providing airflow level range of 16.6 – 43.03  CFM, static pressure level range of 0.0762 – 0.49 mmH²O at noise level range of 4.0 – 14.5 dBA.
  5. SU1225FD12M-RHP PWM powered and regulated and working at 300 – 1200 (±10%) revolutions per minute, providing airflow level range of 16.6 – 51.17  CFM, static pressure level range of 0.0762 – 1.05 mmH²O at noise level range of 4.0 – 24.9 dBA.

For this test and review I received three of the five models, aka Scythe Kaze Flex 120 SU1225FD12L-RD, SU1225FD12H-RP and SU1225FD12M-RHP, and I am very excited to check how they operate and what they have to offer to me and all possible owners of the products worldwide.

All of the fans arrived to me in absolutely identical packages made of a transparent plastic box through which we can see the structure of the fans inside and a carton cover hiding the additional accessories placed inside the package.

Kaze Flex 120 SU1225FD12L-RD Kaze Flex 120 SU1225FD12H-RP Kaze Flex 120 SU1225FD12M-RHP

 

On the front side of the carton part there are the main technical details regarding the products inside every box and that includes main operational information, details regarding the gray dampening shock absorbing corners and info regarding the motors.

Of course, the full technical specifications regarding the products are described on the back of the packages with some additional information regarding the products in several languages.

So, let’s check the structure of the fans and after that check their performance.

 

Scythe Kaze Flex 120 SU1225FD12L-RD, SU1225FD12H-RP and SU1225FD12M-RHP STRUCTURE

Before I start reviewing the products I would like to say that actually this is one model and the only difference between all of the versions is the powering and regulation method and the corresponding cooling performance.

So let’s check the fan structures, capabilities and features.

Kaze Flex 120 SU1225FD12L-RD Kaze Flex 120 SU1225FD12H-RP   Kaze Flex 120 SU1225FD12M-RHP

 

All 3 fans are designed and manufactured with a square and entirely in black matte frame with dimensions of 120 x 120 x 27 mm(105 x 105mm screw hole pattern) with detachable shock absorbing rubber pads located on each corner of the frames. The entirely in gray anti-vibrations pads are made from pretty soft material to absorb any vibrations and kill any possible noise generated from the fans.

On the other hand, all 3 fans are equipped with absolutely identical and entirely in gray propellers featuring 11 not very wide but very sharply angled blades made to provide the optimal airflow/static pressure/noise level balance.

The connection between the pretty solid frames and the very aggressive looking propellers is done by FDB (Fluid Dynamic Bearing), which is made of high quality compressed metal to deliver low friction and long life span of up to 120 000 hours while working at 25 degrees Celsius. And to prove the premium build quality, Scythe used high quality lubricant oil between the shaft of the motor and the bearing to withstand temperatures of up to 250 degrese Celsius, which will result in an outstanding lubricating effect on the motor.

The powering and regulation for all three fans is done via 500mm long, entirely sleeved in black mesh cables and SU1225FD12L-RD, SU1225FD12H-RP are 3-pin powered and regulated, while SU1225FD12M-RHP is 4-pin PWM powered and controlled.

I believe this is enough about the fan structure,  let’s pay more attention to the additional accessories added inside the boxes.

 

Scythe Kaze Flex 120 SU1225FD12L-RD, SU1225FD12H-RP and SU1225FD12M-RHP ACCESSORIES

Kaze Flex 120 SU1225FD12L-RD Kaze Flex 120 SU1225FD12H-RP Kaze Flex 120 SU1225FD12M-RHP

 

All 3 fans are accompanied by absolutely identical accessories pack, which features:

  1. A set of four metal screws
  2. A set of 8 shock absorbing pads
  3. 1 x 3:4-pin power supply adapter

As a next step in this article I believe it is time to install the fans on my test stand and proceed with the actual performance tests.

 

Scythe Kaze Flex 120 SU1225FD12L-RD, SU1225FD12H-RP and SU1225FD12M-RHP 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 test 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:

The test results are shown in the following charts:

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

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

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

After mounting the fans onto the stand, and leaving them to rotate for about 60 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 SU1225FD12L-RD, SU1225FD12H-RP made at least one revolution per minute at about 6.5V, while SU1225FD12M-RHP started operating normally at about 3V. To perform the tests I decreased the operational voltage of the first two models and increased the operational voltage of the PWM model to 5V.

Test at 5V:

At the first test conducted at exactly 5V,:

  1. SU1225FD12L-RD was dead quiet while rotating at 360 revolutions per minute, providing stable airflow of 8.16 cubic meters per hour
  2. SU1225FD12H-RP was generating a tiny noise while rotating at 1140 revolutions per minute, providing stable airflow of 38.4 cubic meters per hour
  3. SU1225FD12M-RHP was also quiet while rotating at 360 revolutions per minute, providing stable airflow of 8.16 cubic meters per hour

Test at 7V:

At the second test conducted at exactly 7V:

  1. SU1225FD12L-RD was rotating at 540 revolutions per minute, delivering airflow level of 10.56 cubic meters per hour. The fan was still quiet
  2. SU1225FD12H-RP was generating a more distinct noise while rotating at 1470 revolutions per minute, providing stable airflow of 47.04 cubic meters per hour
  3. SU1225FD12M-RHP was still quiet while rotating at 720 revolutions per minute, providing stable airflow of 22.56 cubic meters per hour

Test at 9V:

At the third test conducted at 9V,

  1. SU1225FD12L-RD was rotating at 690 revolutions per minute, delivering airflow level of 16.8 cubic meters per hour and remained completely quiet
  2. SU1225FD12H-RP was roaring a lot while rotating at 1710 revolutions per minute, providing stable airflow of 57.12 cubic meters per hour
  3. SU1225FD12M-RHP was still quiet while rotating at 990 revolutions per minute, providing stable airflow of 34.08 cubic meters per hour

Test at 12V:

At the last test conducted at 12V, all fans reached their maximum performance, which is:

  1. SU1225FD12L-RD was rotating at 840 revolutions per minute, delivering airflow level of 25.44 cubic meters per hour and was still completely quiet
  2. SU1225FD12H-RP was really loud while rotating at 2025 revolutions per minute, providing stable airflow of 67.2 cubic meters per hour
  3. SU1225FD12M-RHP was generating a tiny noise coming out of the air passing through the propeller while rotating at 1230 revolutions per minute, providing airflow of 45.6 cubic meters per hour

 

Scythe Kaze Flex 120 SU1225FD12L-RD, SU1225FD12H-RP and SU1225FD12M-RHP CONCLUSIONS

1. Scythe Kaze Flex 120 SU1225FD12L-RD, SU1225FD12H-RP and SU1225FD12M-RHP Performance

After I spent a few hours reviewing and later testing all three models I was left with some pretty nice feelings and some cool thoughts about their capabilities.

Scythe Kaze Flex 120 SU1225FD12L-RD is definitely the fan with one purpose only and that is to act as a case fan to keep the ambient temperature inside every modern case at a decent level and most of all the hardware inside cool and quiet. The fan is really quiet at maximum speed and most of all is capable to deliver steady airflow level.

On the other hand, SU1225FD12H-RP is the complete opposite model, designed to deliver outstanding cooling performance while acting as main cooling unit for CPU heat sinks or water cooling radiators. This model has enough airflow and static pressure to keep the temperature of low, middle and high grade processors at reasonable level while they are running at default, overclocked or even highly overclocked frequencies. The fan will definitely handle to provide great cooling results and a feeling of reliability.

And last but not least, SU1225FD12M-RHP is the most balanced mode, which when set to work at low speed is a good case fan option, while when set to work at maximum speed is a good option to keep ow and middle grade processors working with normal daily load at decent temperature with a low noise level.

All models are very good choices and will definitely do their job in their specific area.

 

2. Scythe Kaze Flex 120 SU1225FD12L-RD, SU1225FD12H-RP and SU1225FD12M-RHP Appearance:

All three models look really sleek and stylish with their black/grey colour scheme and will definitely stay neutral in every modern case with black interior compatible with 120mm fans. On the other hand, the propeller shape is pretty aggressive and will totally attract the attention when they are not rotating.

I think Scythe Kaze Flex 120 SU1225FD12L-RD deserve the following reward:

Scythe Kaze Flex 120 SU1225FD12H-RP:

Scythe Kaze Flex 120 SU1225FD12M-RHP:

 

Scythe Kaze Flex 120 SU1225FD12L-RD, SU1225FD12H-RP and SU1225FD12M-RHP have been added to the 120mm fans catalogue.

Official price (MSRP): Scythe Kaze Flex 120 SU1225FD12L-RD:  7.80 euro

Official price (MSRP): Scythe Kaze Flex 120 SU1225FD12H-RP:  7.80 euro

Official price (MSRP): Scythe Kaze Flex 120 SU1225FD12M-RHP:  8.20 euro

Warranty: 24 months

 

Special thanks to Scythe for providing us with a test sample.

Scythe Kaze Flex 120 SU1225FD12L-RD, SU1225FD12H-RP and SU1225FD12M-RHP – Test and Review
9.1 Total Score

Scythe Kaze Flex 120 SU1225FD12L-RD Performance
7
Scythe Kaze Flex 120 SU1225FD12H-RP Performance
10
Scythe Kaze Flex 120 SU1225FD12M-RHP Performance
8
Scythe Kaze Flex 120 SU1225FD12L-RD Noise Level
10
Scythe Kaze Flex 120 SU1225FD12H-RP Noise Level
7
Scythe Kaze Flex 120 SU1225FD12M-RHP Noise Level
9
Additional accessories
9
Appearance
10
User Rating: 4.7 (2 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.
1 Comment
  1. Reply bong 11.10.2017 at 8:31

    Scythe Mugen 5 owner here, one SU1225FD12M included very effective. Would purchase another for 2 fan set up if it’s cheap enough.

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