GELID GX-7 & Tranquillo Rev.2 CPU Coolers

Cooling
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Stock Fan Measurements

Specifications: GELID GX-7 Rev.2 Stock Fan
Manufacturer
Power Rating
5.4 W
Model Number
FN-FW12BPL-18
Airflow Rating
75.6 CFM
Bearing Type
Nanoflux Bearing
Speed Rating
600 ~ 1,800 RPM
Corners
Open
Noise Rating
10 ~ 26.8 dBA
Frame Size
120 x 120 x 25 mm
Header Type
4-pin
Fan Blade Diameter
110 mm
Starting Voltage
3.7 V
Hub Size
39 mm
Weight
110 g
Data in green cells provided by the manufacturer or observed; data in the blue cells were measured.

The GX-7 Rev.2's stock fan is a member of GELID's Wing series, the Wing 12 PL, a 120 mm PWM model with blue LEDs residing at the end each curved strut. The fan looks a little naked as the combined diameter of the impeller and blades is about 4 mm less than typical 120 mm fans. The fan's nine translucent blue blades are equipped with "winglets," tips on the end of each blade that stick out like a shark's fin on the intake side. We're not sure what purpose they serve especially as they're located on the back side of the fan nor does GELID state specifically why they're advantageous. The Wing series uses a "Nanoflux" bearing that features a magnetic design that allows the impeller to be easily detached for cleaning.


At 7V, the GX-7 Rev.2 stock fan emitted a noise level of 17 dBA@1m. The acoustic profile was fairly broadband.


Stock Fan Measurements
Voltage
Speed
SPL@1m
12V
1950 RPM
35~36 dBA
9V
1480 RPM
27 dBA
8V
1250 RPM
22 dBA
7V
1020 RPM
17 dBA
6V
780 RPM
13 dBA
5V
560 RPM
11 dBA
Measuring mic positioned 1m at diagonal angle from the center of the heatsink.
Ambient noise level: 10~11 dBA.

As the fan has PWM capability and a low starting voltage, it can be run at inaudible levels (e.g. 5V, 560 RPM) or cranked up to a head-splitting 35~36 dBA@1m at full speed. The Wing 12 PL's acoustics were consistently good throughout its wide range. Overall the sound it produced was quite smooth at one meter's distance. Closer up, we could detect a low-pitched hum that became more prominent as the speed was lowered but masked inside a case, it shouldn't be noticeable.

Specifications: GELID Tranquillo Rev.2 Stock Fan
Manufacturer
Power Rating
2.16 W
Model Number
FN-PX12-15?
Airflow Rating
58 CFM
Bearing Type
Hydro Dynamic Bearing
Speed Rating
750 ~ 1,500 RPM
Corners
Open
Noise Rating
12 ~ 25.5 dBA
Frame Size
120 x 120 x 25 mm
Header Type
4-pin
Fan Blade Diameter
114 mm
Starting Voltage
6.4 V
Hub Size
41 mm
Weight
110g
Data in green cells provided by the manufacturer or observed; data in the blue cells were measured.

The Tranquillo Rev.2's stock fan has a more conventional design with a large hub, seven fan blades, and straight struts. It's a PWM 120 mm model with fluid bearings.


At 8V, the Tranquillo Rev.2 stock fan generates a noise level of 17 dBA@1m.


Stock Fan Measurements
Voltage
Speed
SPL@1m
12V
1390 RPM
25 dBA
9V
1100 RPM
19 dBA
8V
990 RPM
17 dBA
7V
830 RPM
14 dBA
6V
260 RPM
<11 dBA
Measuring mic positioned 1m at diagonal angle from the center of the heatsink.
Ambient noise level: 10~11 dBA.

The Tranquillo's fan has a lower rotational speed so at 12V it was substantially quieter than the Wing 12 PL, measuring only 25 dBA@1m. It had issues with voltage control, exhibiting a huge drop-off in speed when set under 7V. The acoustics were also very muddy, producing tonality at various frequencies throughout its range. To the human hear it sounded like two or three tones of varying pitch competing with one another. At close proximity it actually sounded better at higher speeds as the increased air turbulence helped drown it out.



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