Noctua NH-L12 Low Profile Cooler

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Stock Fan Measurements

Specifications: Noctua NH-L12 Stock Fan (120mm)
Manufacturer
Power Rating
0.6 W
Model Number
NF-F12 PWM
Airflow Rating
93.4 m³/h
Bearing Type
SSO
Speed Rating
1500 RPM
Corners
Open
Noise Rating
22.4 dBA
Frame Size
120 x 120 x 25 mm (26 mm thick with the corner padding)
Header Type
4-pin
Fan Blade Diameter
113 mm
Starting Voltage
4.6 V
Hub Size
41 mm
Weight
170 g
Data in green cells provided by the manufacturer or observed; data in the blue cells were measured.

Noctua's standard 120 mm fan model has been the NF-P12, which had "vortex-control notches," small portions cut out of the fan blades to reduce turbulence and spread the noise over a wider frequency range. The model included with the NH-L12 is a modified version with the notches moved to the struts which are wide and thin and sit at an angle. The struts are more numerous, while the blades are fewer and straighter.

Specifications: Noctua NH-L12 Stock Fan (92mm)
Manufacturer
Power Rating
0.96 W
Model Number
NF-B9 PWM
Airflow Rating
64.3 m³/h
Bearing Type
SSO
Speed Rating
1600 RPM
Corners
Open
Noise Rating
17.6 dBA
Frame Size
92 x 92 x 25 mm
Header Type
4-pin
Fan Blade Diameter
87 mm
Starting Voltage
4.7 V
Hub Size
32 mm
Weight
80 g
Data in green cells provided by the manufacturer or observed; data in the blue cells were measured.

By comparison the 92 mm model is more like the old design with straight struts and notches on the blades. The blade edges have a rather unusual shape, like the cutting implements of ancient hominids.

Stock Fan Measurements
Voltage
Stock 120 mm*
Stock 92mm*
Combined
SPL@1m (dBA)
Speed (RPM)
SPL@1m (dBA)
Speed (RPM)
SPL@1m (dBA)
12V
1420
26
1680
23
28~29
10V
1190
20~21
1450
19~20
22~23
9V
1080
18
1320
17
20
8V
960
15
1200
15
17
7V
840
13
1060
13
14~15
6V
720
11~12
920
11~12
12
*Single fans mounted to heatsink underside.
Measuring mic positioned 1m at diagonal angle from the center of the heatsink.
Ambient noise level: 10~11 dBA.

The two fans were close in noise level and had a fairly smooth character, but only at lower speeds. At 9V and above, the smaller fan was noticeably whiny while the larger model took on a lower, buzzy profile. Unfortunately their noise signatures didn't really blend together, creating a cacophony when both fans are used simultaneously. The 92 mm fan hits the higher notes while the 120 mm fan generates a low-pitched hum.


At 9V, the two stock fans together produced 20 dBA@1m.



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