ZEROtherm Nirvana CPU Cooler

Cooling
Viewing page 5 of 6 pages. Previous 1 2 3 4 5 6 Next

TEST RESULTS

Stock Fan Testing

Stock Fan Measurements
Voltage
Speed
12V
31 dBA
1930 RPM
10V
26 dBA
1580 RPM
9V
20 dBA
1180 RPM
8V
15 dBA
760 RPM
7V
14 dBA
550 RPM

Fan @ 12V: The noise generated is very buzzy, but the abundance of turbulence masks a slight tone that can be heard in close proximity. Needless to say it's far too loud at 31 dBA.

Fan @ 10V: At 10V there is a 5 dBA reduction in noise which is significant but not enough to make it tolerable. Two distinct noises also emerge: A low-pitched hum which is likely caused by vibration, and tonality in the fan's bearings/motor.

Fan @ 9V: At this level the fan noise becomes bearable. The lack of turbulence from the fan brings focus to the humming mentioned earlier.

Fan @ 8V/7V: At 8V and below, the vibration and tonality make the fan sound "wobbly." This effect is audible at 1m in an open testing environment but would likely be masked inside a case where it would be essentially inaudible.


Tonality evident at ~800 Hz.

Cooling Results

ZEROtherm Nirvana
Fan Voltage
Temp
°C Rise
°C/W
12V
31 dBA
36°C
14
0.18
10V
26 dBA
38°C
16
0.21
9V
20 dBA
39°C
17
0.22
8V
15 dBA
44°C
22
0.28
7V
14 dBA
49°C
27
0.35
Load Temp: CPUBurn for ~10 mins.
°C Rise: Temperature rise above ambient (22°C) at load.
°C/W: based on the amount of heat dissipated by the CPU (measured 78W); lower is better.

The Nirvana performed well at high fan speeds with a thermal rise of 14°C at 12V. Cooling suffered little when the fan speed was dialed back to 10V and then 9V, despite a dramatic reduction in noise. When the fan finally entered quiet territory at 8V, performance decreased by 5°C and then another 5°C at 7V even though the SPL was barely affected. At low fan speeds heat dissipation takes a nose dive. This is typical for heatsinks with tight fin spacing, but the rate at which its effectiveness degrades is still quite rapid.



Previous 1 2 3 4 5 6 Next

Cooling - Article Index
Help support this site, buy from one of our affiliate retailers!
Search: