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TEST RESULTS
Stock Fan Measurements: Gelid Silent Spirit
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Stock Fan Specifications
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|
Manufacturer
|
|
Power Rating
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2.76 W |
|
Model Number
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G12922524(M)-P
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Airflow Rating
|
48.5 CFM |
|
Bearing Type
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Hydro Dynamic |
Speed Rating
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900~2400 RPM |
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Corners
|
N/A |
Noise Rating
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10~25.8 dBA |
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Frame Size
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101 x 101 x 40 mm |
Header Type
|
4-pin PWM |
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Fan Blade Diameter
|
87 mm |
Starting Voltage
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3.4 V |
|
Hub Size
|
36 mm |
Weight
|
70 g |
|
Data in green cells provided by the manufacturer
or observed; data in the blue cells were measured.
|
The Silent Spirit's stock fan is a clone of those used by Arctic Cooling, a
7-blade model with fluid bearings, minimal housing, soft-mounted to a plastic
frame that clips onto the heatsink. The fan can start with as little as 3.4V,
which is atypical for a PWM model.
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Stock Fan Measurements
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|
Voltage
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Speed
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SPL @1m
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|
12V
|
2470 RPM
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32 dBA
|
|
9V
|
2030 RPM
|
26 dBA
|
|
7V
|
1750 RPM
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20 dBA
|
|
6V
|
1470 RPM
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15~16 dBA
|
|
5V
|
1060 RPM
|
12 dBA
|
|
Measuring mic positioned 1m at diagonal angle from
the intake side of the fan.
Ambient noise level: 11 dBA.
|
Acoustically speaking, the stock fan is fairly good. It is turbulent, buzzy,
and generates a hum at 9V~12V. The hum disappears at 7V, and the character becomes
mostly smooth. It is quiet at 6V with a slight rattle audible up-close. At 5V,
it is practically inaudible.
Stock Fan Measurements: Scythe Samurai ZZ
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Stock Fan Specifications
|
|
Manufacturer
|
|
Power Rating
|
2.04 W |
|
Model Number
|
SY9225SL12M-P
|
Airflow Rating
|
6.7~55.55 CFM |
|
Bearing Type
|
Sleeve |
RPM Rating
|
300~2500 RPM |
|
Corners
|
Open |
Noise Rating
|
10~25.8 dBA |
|
Frame Size
|
92 x 92 x 25 mm |
Header Type
|
4-pin PWM |
|
Fan Blade Diameter
|
86 mm |
Starting Voltage
|
6.8 V |
|
Hub Size
|
33 mm |
Weight
|
90 g |
|
Data in green cells provided by the manufacturer
or observed; data in the blue cells were measured.
|
The Scythe fan is a Slip Stream, though their 92 mm variants have fewer blades
and less curvature.
|
Stock Fan Measurements
|
|
Voltage
|
Speed
|
SPL@1m
|
|
Free Air
|
Mounted
|
|
12V
|
2440 RPM
|
26~27 dBA
|
34~35 dBA
|
|
10V
|
2080 RPM
|
22 dBA
|
29~30 dBA
|
|
9V
|
1810 RPM
|
17~18 dBA
|
25 dBA
|
|
8V
|
1460 RPM
|
13~14 dBA
|
18 dBA
|
|
7.7V
|
1300 RPM
|
13 dBA
|
15 dBA
|
|
7.5V
|
940 RPM
|
<11 dBA
|
<11 dBA
|
|
Measuring mic positioned 1m at diagonal angle from
the intake side of the fan.
Ambient noise level: 11 dBA.
|
Like other Slip Streams, this 92 mm variant is very smooth, but buzzy at 9V
and higher. Oddly, the fan is significantly louder when mounted on the heatsink
than in free air, measuring about 7 dBA higher when the fan is set to 9V or
higher. Thankfully the difference is much less at lower fan speeds, 3~4 dBA
at 8V, and only 2 dBA at 7.7V. At 7.5V and below, the fan is inaudible in both
scenarios.
The Scythe Katana 3, a
slanted but mostly upright cooler, is equipped with the same fan model and fan
clips but the noise difference was much smaller when we tested it. The increase
in noise on the Samurai ZZ is mostly turbulent, and likely caused by the air
bouncing off the motherboard. Taller downblowing coolers don't seem to be affected
by this phenomenon.
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