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Cooling Results - Two Fan Configuration
Resistance to airflow is higher the closer the fins are to one another, and
the wider heatsink, the further air has to travel to cool it effectively. The
Mugen-2 is wider than most at 100 mm wide and its fins are tightly-spaced, making
it a good candidate for two fans in a push-pull configuration.
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Scythe Mugen-2 w/ reference 120mm fan
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Fan Voltage
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SPL@1m
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Temp
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°C Rise
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°C/W
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12V
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16 dBA
|
36°C
|
15
|
0.19
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|
9V
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13 dBA
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38°C
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17
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0.22
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7V
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12 dBA
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40°C
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19
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0.24
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5V
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11 dBA
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44°C
|
23
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0.29
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Scythe Mugen-2 w/ Two reference 120mm fans
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|
12V
|
20 dBA
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32°C
|
11
|
0.14
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9V
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14~15 dBA
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33°C
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12
|
0.15
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|
7V
|
12 dBA
|
34°C
|
13
|
0.17
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5V
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11 dBA
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38°C
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16
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0.21
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Load Temp: CPUBurn for ~10 mins.
°C Rise: Temperature rise above ambient (21°C) at load.
°C/W: based on the amount of heat dissipated by the CPU (measured
78W); lower is better. |
With two of our reference fans in a push-pull configuration running at 12V,
the Mugen-2 exhibited only a minor 4°C improvement while increasing the
noise level by 4 dBA. As the fan speeds were lowered, the improvement increased
— two fans seem particularly fit for use at low fan speeds. At 9V, the
two fan setup was 1~2 dBA louder and 5°C cooler than one fan. At 7V and
5V, there was no measurable increase in noise using dual fans, and the CPU temperature
was improved by 6°C and 7°C, respectively.
Comparables
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°C rise Comparison: The Best of the Best
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Heatsink
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Nexus 120mm fan voltage / SPL @1m
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|
12V
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9V
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7V
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5V
|
|
16 dBA
|
13 dBA
|
12 dBA
|
11 dBA
|
|
Prolimatech Megahalems
|
10
|
14
|
17
|
20
|
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Thermalright U120E
|
12
|
14
|
17
|
24
|
|
Thermalright HR-01+
|
13
|
15
|
16
|
20
|
|
Xigmatek HDT-S1283
|
13
|
15
|
18
|
22
|
|
Noctua NH-U12P
|
14
|
16
|
17
|
21
|
|
Zalman CNPS10X Extreme
|
14
|
17
|
21
|
26
|
|
Zerotherm Zen FZ120
|
15
|
16
|
19
|
24
|
|
Scythe Mugen-2
|
15
|
17
|
19
|
23
|
|
Scythe Ninja 2
|
17
|
18
|
20
|
23
|
|
Thermolab Baram
|
18
|
20
|
22
|
25
|
|
Scythe Mugen-2 w/ Two reference 120mm fans
|
| Scythe Mugen-2 |
11
|
n/a
|
13
|
16
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The Mugen-2 managed a slight performance increase over the Ninja 2. It's a solid
heatsink, but used as delivered. it doesn't cool quite well enough to be called elite. As the fan speed is decreased, its relative position improves and it manages to get within 2-3°C of the Thermalright
HR-01+, even though the Mugen's fin spacing is tighter than most of
the competition.
Where the Mugen-2 really shines is when a second quiet fan is added in a push-pull configuration. With both fans set to spin ~700rpm or lower, there is essentially no noise increase compared to just one fan, but the cooling performance moves up to levels never achieved in the past. A temperature rise of just 16°C at a noise level of 11 dBA@1m is simply astonishing performance.
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