Scythe Mugen-2 CPU Cooler

Cooling
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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.

Scythe Mugen-2 w/ reference 120mm fan
Fan Voltage
SPL@1m
Temp
°C Rise
°C/W
12V
16 dBA
36°C
15
0.19
9V
13 dBA
38°C
17
0.22
7V
12 dBA
40°C
19
0.24
5V
11 dBA
44°C
23
0.29
Scythe Mugen-2 w/ Two reference 120mm fans
12V
20 dBA
32°C
11
0.14
9V
14~15 dBA
33°C
12
0.15
7V
12 dBA
34°C
13
0.17
5V
11 dBA
38°C
16
0.21
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

°C rise Comparison: The Best of the Best
Heatsink
Nexus 120mm fan voltage / SPL @1m
12V
9V
7V
5V
16 dBA
13 dBA
12 dBA
11 dBA
Prolimatech Megahalems
10
14
17
20
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

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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