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SCYTHE ULTRA KAZE DFS123812H-3000
Ambient noise at the time of testing was 18 dBA.
| Brand |
Scythe |
Power Rating |
0.60A |
| Manufacturer |
Scythe |
Airflow Rating |
133.6 CFM |
| Model Number |
DFS123812H-3000
|
RPM Rating |
3,000 RPM |
| Retail Availability |
Yes |
Noise Rating |
45.9 dBA |
| Bearing Type |
Sleeve |
Header Type |
3-pin |
| Hub Size |
2.17" |
Starting Voltage |
3.1 |
| Frame Size |
120 x 120 x 38mm |
Number of Samples |
2 |
| Weight |
300g |
Variance Noted |
See below |
|
Voltage
|
Noise
|
RPM
|
CFM
|
|
12V
|
47 dBA@1m
|
2760 RPM
|
107 CFM
|
|
9V
|
40 dBA@1m
|
2180 RPM
|
77 CFM
|
|
7V
|
34 dBA@1m
|
1710 RPM
|
56 CFM
|
|
5V
|
24 dBA@1m
|
1160 RPM
|
34 CFM
|
|
@20 CFM (3.6V)
|
19 dBA@1m
|
730 RPM
|
20 CFM
|
Scythe also carries a line of 38mm thick, high
performance fans. The Ultra Kazes come in three speeds: 3000, 2000, and 1000
RPM. The extra width allows for deeper fan blades, but with it comes increased
weight and a larger, more powerful motor — the hub size is more than two inches
across. A molex adapter with
RPM header is included. We highly recommend using the adapter as lower quality
fan headers may not be able to supply enough power and may burn out if used
in conjunction with this fan — especially the high speed variant. The spokes are curved exactly like the Like the Slip Stream series for acoustic benefits.
The 3000 RPM model is the loudest 120mm fan we've tested. Its acoustic quality is
poor, droning and buzzing at low speeds, and shaking and vibrating
at high speeds. It also clicks throughout its entire range and one of our samples
had an unpleasant resonant spike at 7V. It is nowhere close to our standards
for a silent fan, and unfortunately doesn't offer any performance advantage
either.
It pushed less air than the Slip Stream 1200 RPM and 1600 RPM models while producing
the same level of noise (24 dBA) and it was the only fan that was unable to
output 20 CFM without overtaking the ambient noise level. Being so large, heavy,
and with poor acoustics, one would think it would at least perform more efficiently,
but it just wasn't the case, at least for the H model. It may have something
to do with the unusually high weight. At 300g it is 70g heavier than the lower
speed Ultra Kazes.
One has to assume that the greater depth of the blades result in higher pressure, which would probably be useful in a high airflow impedance application like a heatsink with very tightly spaced fins. (We do not test for pressure currently.) However, this is not something we recommend, and most SPCR readers seek to minimize airflow impedance in order to enable good cooling with very slow fan speeds.
Noise Recording
- Scythe Ultra Kaze DFS123812H-3000— 3.6V-5V-7V-9V-12V with 5s
ambient between each level: One meter, at 20 CFM (3.6V)
SCYTHE ULTRA KAZE DFS123812L-2000
Ambient noise at the time of testing was 18 dBA.
| Brand |
Scythe |
Power Rating |
0.25A |
| Manufacturer |
Scythe |
Airflow Rating |
87.63 CFM |
| Model Number |
DFS123812L-2000
|
RPM Rating |
2,000 RPM |
| Retail Availability |
Yes |
Noise Rating |
32.91 dBA |
| Bearing Type |
Sleeve |
Header Type |
3-pin |
| Hub Size |
2.17" |
Starting Voltage |
2.4 |
| Frame Size |
120 x 120 x 38mm |
Number of Samples |
2 |
| Weight |
230g |
Variance Noted |
None |
|
Voltage
|
Noise
|
RPM
|
CFM
|
|
12V
|
37 dBA@1m
|
2030 RPM
|
71 CFM
|
|
9V
|
32 dBA@1m
|
1670 RPM
|
53 CFM
|
|
7V
|
25 dBA@1m
|
1380 RPM
|
42 CFM
|
|
5V
|
20 dBA@1m
|
1060 RPM
|
29 CFM
|
|
@20 CFM (3.3V)
|
~18 dBA@1m
|
740 RPM
|
20 CFM
|
The L2000 Ultra Kaze 120 has characteristics similar to the H model but it is much less aggressive sounding. It exhibited a lot of drone, and some buzz. Despite being 1000 RPM slower than the H model, it could not be be described as quiet, even at 5V. Performance was more efficient compared to the
high speed model, but not as good as the Slip Streams.
Noise Recording
- Scythe Ultra Kaze DFS123812L-2000— 3.3V-5V-7V-9V-12V with 5s
ambient between each level: One meter, at 20 CFM (3.3V)
SCYTHE ULTRA KAZE DFS123812L-1000
| Brand |
Scythe |
Power Rating |
0.25A |
| Manufacturer |
Scythe |
Airflow Rating |
44.44 CFM |
| Model Number |
DFS123812L-1000
|
RPM Rating |
1,000 RPM |
| Retail Availability |
Yes |
Noise Rating |
19.81 dBA |
| Bearing Type |
Sleeve |
Header Type |
3-pin |
| Hub Size |
2.17" |
Starting Voltage |
3 |
| Frame Size |
120 x 120 x 38mm |
Number of Samples |
3 |
| Weight |
220g |
Variance Noted |
None |
|
Voltage
|
Noise
|
RPM
|
CFM
|
|
12V
|
20 dBA@1m
|
1000 RPM
|
27 CFM
|
|
9V
|
~18 dBA@1m
|
780 RPM
|
22 CFM
|
|
7V
|
<18 dBA@1m
|
610 RPM
|
16 CFM
|
|
5V
|
<18 dBA@1m
|
440 RPM
|
11 CFM
|
|
@20 CFM (8.3V)
|
~18 dBA@1m
|
720 RPM
|
20 CFM
|
The 1000 RPM model is similar to the other two in the Ultra Kaze series. The lower speed results
in less drone and buzz, but its acoustic character is still noticeably
poor even when undervolted to 5V and 18 dBA. Performance was very similar to
the 2000 RPM variant. It's simply not quiet enough. There are
many, many alternatives that will provide the same airflow, but with much better
acoustics.
The Ultra Kaze line is disappointing. They are really only suitable for high
heat, high impedance situations where noise is not a factor.
Noise Recording
- Scythe Ultra Kaze DFS123812L-1000— 5V-7V-8.3V-9V-12V with 5s
ambient between each level: One
meter, at 20 CFM (3.3V)
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