Cogage TRUE Spirit & Zalman CNPS10X Quiet CPU Coolers

Cooling
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TEST RESULTS

The ambient conditions during testing were 10~11 dBA and 22~23°C.

Stock Fan Measurements: Cogage TRUE Spirit 1366


TRUE Spirit stock fan.

120 mm Stock Fan Specifications
Manufacturer
Power Rating
2.52 W
Model Number
CGG-1212PSL
Airflow Rating
66.5 CFM
Bearing Type
?
Speed Rating
1500 RPM +/-15%
Corners
Open
Noise Rating
37.4 dBA
Frame Size
120 x 120 x 25 mm
Header Type
4-pin PWM
Fan Blade Diameter
112 mm
Starting Voltage
~4.0 V
Hub Size
40 mm
Weight
90 g
Data in green cells provided by the manufacturer or observed; data in the blue cells were measured.

The Cogage stock fan is a fairly typical looking fan with seven translucent blades with mild curvature. Their trailing edges are almost completely parallel with the struts, which suggests high tonality might be a characteristic. The fan is also very light, weighing in at only 90 grams, 20~30 grams less than most 120 mm fans.

TRUE Spirit Stock Fan Measurements
Voltage
Speed
SPL @1m
12V
1690 RPM
31~32 dBA
9V
1320 RPM
24 dBA
7V
1050 RPM
17 dBA
6V
870 RPM
14~15 dBA
5V
710 RPM
12 dBA
Measuring mic positioned 1m at diagonal angle from the intake side of the fan.
Ambient noise level: 11 dBA.

The fan's acoustic character was generally buzzy and at close proximity there was a noticeable wobble. It also had a tendency to rattle at 12V, possibly due to its lack of mass, and was very loud at 31~32 dBA. As the fan speed was decreased, the buzzing became less distracting but didn't vanish until it reached about 6V. The fan became quiet at about 7V, measuring 17 dBA@1m. It was virtually inaudible at 5V.


The TRUE Spirit stock fan measured 17 dBA@1m at 7V. It had some tonal elements as indicated by the sharp spikes in the 300~600 Hz range.

Stock Fan Measurements: Zalman CNPS10X Quiet


Zalman CNPS10X Quiet stock fan.

120 mm Stock Fan Specifications
Manufacturer
Power Rating
3.0 W
Model Number
ZF1125ATM
Airflow Rating
?
Bearing Type
dual ball bearing
RPM Rating
1400 RPM +/- 10%*
Corners
N/A
Noise Rating
26 dBA*
Frame Size
120 x 120 x 25 mm
Header Type
4-pin PWM
Fan Blade Diameter
112 mm
Starting Voltage
~4.1 V
Hub Size
43 mm
Weight
130 g
Data in green cells provided by the manufacturer or observed; data in the blue cells were measured.
* specifications when paired with Fan Mate 2 controller (max. 11V)

The Zalman stock fan is similar to the one included with the CNPS10X. It is a dual ball bearing model with a black frame and only one set of corners (the ones on the intake side have been omitted), but despite this fact, the fan is a fairly hefty 130 grams.

CNPS10X Quiet Stock Fan Measurements
Voltage
Speed
SPL @1m
12V
1570 RPM
27 dBA
9V
1230 RPM
19~20 dBA
7V
970 RPM
14 dBA
5V
680 RPM
12 dBA
Measuring mic positioned 1m at diagonal angle from the intake side of the fan.
Ambient noise level: 11 dBA.

At full speed, the Zalman stock fan sounded very buzzy with a slight flutter that sounded like soft is chafing against the blades. At 9V, the buzzing turned into a low-pitched hum,and the flutter started to fade. It became what we would consider quiet starting at about 8V, and at 7V it was pleasantly smooth and barely audible at one meter's distance. Of our two review samples, the Zalman fan was smoother and quieter in general than the Cogage fan.


The CNPS10X stock fan measured 14 dBA@1m at 7V.



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