Thermalright Venomous X Silent Edition CPU Cooler

Cooling
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Stock Fan Measurements

Specifications: Thermalright Venomous X Silent Edition Stock Fan
Manufacturer
Power Rating
1.56 W
Model Number
TR-FDB-12-600
Airflow Rating
30.5 CFM
Bearing Type
Fluid Dynamic
Speed Rating
600 RPM ± 10%
Corners
Open
Noise Rating
13.1 dBA
Frame Size
120 x 120 x 25 mm
Header Type
3-pin
Fan Blade Diameter
113 mm
Starting Voltage
8.4 V
Hub Size
47 mm
Weight
160 g
Data in green cells provided by the manufacturer or observed; data in the blue cells were measured.

The fans included with the Venomous X Silent Edition use fluid bearings and spin at just 600 RPM. They have a standard seven blade design with gentle curves and straight struts. They weight about 160 grams, which is 40 grams more than most 12 cm models. Much of the extra weight is probably due to the motor as the hub measures an unusually wide 47 mm across.

Stock Fan Measurements
Voltage
Avg. Speed
SPL@1m
12V
610 RPM
11 dBA
10V
490 RPM
<10~11 dBA
Measuring mic positioned 1m at diagonal angle from the center of the heatsink.
Ambient noise level: 10~11 dBA.

As for the noise level of the fan, it's almost nonexistent. When mounted on the heatsink, It produces a slight hum at close proximity but is completely inaudible at one meter's distance, even at full speed. It barely registered on our sound meter, measuring about half a decibel more than our anechoic chamber's noise floor. This is about as close to silent as it gets, and undervolting it is pointless unless the fan is going to reside right next to your ear.


With both stock fans installed, the Venomous X measures just 11~12 dBA@1m.

With both fans mounted on the heatsink, there was barely any increase in noise level. Running the pair at full speed is slightly quieter than the 12 dBA@1m generated by our reference Nexus 120 mm fan running at just 7V.

Cooling Results

Fan Voltage
One Fan
Two Fans
SPL@1m
Thermal Rise
Thermal Rise
SPL@1m
Stock Fan: Thermalright TR-FDB-12-600
12V
11 dBA
47°C
42°C
11~12 dBA
Reference 120mm Fan: Nexus Real Silent
12V
16 dBA
38°C
36°C
18 dBA
9V
13 dBA
41°C
39°C
14 dBA
7V
12 dBA
43°C
40°C
12~13 dBA
Reference 140mm Fan: Noctua NF-P14
12V
28~29 dBA
38°C
36°C
30~31 dBA
9V
21 dBA
40°C
38°C
22~23 dBA
8V
18 dBA
41°C
39°C
19 dBA
7V
15~16 dBA
43°C
41°C
16~17 dBA
6V
13 dBA
44°C
42°C
14 dBA

With a single stock fan, the Venomous X was a mediocre performer with a thermal rise of 47°C, however this was an impressive result as it was inaudible. Adding the second fan improved cooling by 5°C while barely affecting the overall noise level. Doubling up the stock fans gave us slightly better acoustics and temperatures than our reference Nexus 120 mm fan running at 7V. This too was commendable as the Nexus is the best performing fan we've come across.

Using two reference fans resulted in only a 2~3°C improvement but also on emitted 1 dB more using the stock fans, so it's not a conclusive which combination is superior. Our reference Noctua 140 mm fans actually performed slightly worse, allowing the processor to heat up about 2~3°C more than the Nexus fans at comparable noise levels.



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