Prolimatech Armageddon & Coolermaster V8 CPU Coolers

Cooling
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TEST RESULTS

Reference Fan Measurements: Scythe Slip Stream 140 mm

As we do not currently have a reference 140 mm fan, the Prolimatech Armageddon was tested with our reference Nexus 120 mm, the Noctua NF-P14 found on the NH-D14 heatsink, and an untested Scythe 140 mm fan.

Scythe 140 mm Fan Specifications
Manufacturer
Power Rating
2.64 W
Model Number
SM1425SL12LM-P
Airflow Rating
69.93 CFM
Bearing Type
Sleeve
RPM Rating
1300 RPM
Corners
Open
Noise Rating
24.7 dBA
Frame Size
120 x 120 x 25 mm
Header Type
4-pin PWM
Fan Blade Diameter
128 mm
Starting Voltage
~5.4 V
Hub Size
40 mm
Weight
140 g
Data in green cells provided by the manufacturer or observed; data in the blue cells were measured.

The fan we chose was pulled off a Scythe Grand Kama Cross heatsink, a 140 mm PWM model from Scythe's Slip Stream lineup. It has a curved, but quite round housing, 120 mm fan holes, and a surprisingly small hub.

Scythe 140 mm Fan Measurements
Voltage
Speed
SPL @1m
12V
1310 RPM
26 dBA
10V
1090 RPM
21 dBA
9V
970 RPM
17 dBA
8V
820 RPM
14 dBA
7V
680 RPM
11~12 dBA
Measuring mic positioned 1m at diagonal angle from the intake side of the fan.
Ambient noise level: 11 dBA.

The Scythe fan exhibits some minor bearing chatter, and is a little whiny at full speed, but other than that, its acoustics are excellent throughout its range, like other members of the Slip Stream family. The fan is really only too loud at 12V. At 10V, the measured noise level is high at 21 dBA, but all you really hear is turbulence. It undervolts well, becoming inaudible at around 7V, so we did not bother testing it below that level.


The Scythe 140 mm fan measured 17 dBA@1m. Frequency analysis revealed practically no tonality.

Stock Fan Measurements: Coolermaster V8

V8 Stock Fan Specifications
Manufacturer
Power Rating
3.84 W
Model Number
A12025-20RB-4DP-F1
Airflow Rating
69.69 CFM
Bearing Type
Rifle
Speed Rating
1800 RPM
Corners
Open
Noise Rating
21 dBA
Frame Size
120 x 120 x 25 mm
Header Type
4-pin PWM
Fan Blade Diameter
111 mm
Starting Voltage
~4.0 V
Hub Size
43 mm
Weight
110 g
Data in green cells provided by the manufacturer or observed; data in the blue cells were measured.

The V8 stock fan is similar to the one found on the GeminII S, with 9 translucent blades with heavy curvature and rifle bearings.

V8 Stock Fan Measurements
Voltage
Speed
SPL @1m
With Cover
Without Cover
12V
1980 RPM
32~33 dBA
31 dBA
9V
1460 RPM
23~24 dBA
22 dBA
8V
1240 RPM
19~20 dBA
18~19 dBA
7V
1020 RPM
15 dBA
14 dBA
6V
790 RPM
12 dBA
12 dBA
Measuring mic positioned 1m at diagonal angle from the intake side of the fan.
Ambient noise level: 11 dBA.

Like the Scythe 140 mm, the V8 stock fan has very good acoustics. It's loud, turbulent, and produces a noticeable hum at 12V, but is much quieter at 9V, though it has a tendency to drone. At 8V it sounds fairly smooth but is a little buzzy. At 7V and below it is very quiet, becoming inaudible at 5V. The fan sounds noticeably better if the top cover is removed, and doing so does not affect thermal performance. The included fan controller can only dial down the fan's speed to about 1430 RPM, close to 9V.


The V8 stock fan also sounded very smooth with no noticeable tonal elements.



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