Scythe Mugen-2 CPU Cooler

Cooling
Viewing page 5 of 7 pages. Previous 1 2 3 4 5 6 7 Next

TEST RESULTS

Stock Fan Testing

The stock fan is a PWM version of the SY1225SL12M from the acclaimed Slip Stream series. We've been waiting a long time for Scythe to begin shipping their heatsinks with PWM fans and it looks like they're finally starting to make the transition.


Stock Fan Specifications
Manufacturer Scythe Power Rating 2.16 W
Model SY1225SL12LM-P Airflow Rating 74.25 CFM
Bearing Type Sleeve RPM Rating 1200
Frame Size 120 x 120 x 25 mm Noise Rating 26.5 dBA
Hub Size 1.41" (35.9 mm) Header Type 4-pin PWM
Weight 110 grams Starting Voltage ~5V
The data in the green cells is provided by the manufacturer; we measured the data cited in the blue cells

Like many other PWM fans, the fan speeds drop off very quickly when the voltage is decreased. We typically test fans at 12V, 9V, 7V, and 5V, but this particular fan becomes inaudible in our anechoic chamber at only 8V, so we adjusted our levels appropriately. The fan speeds at 12V, 10V, 9V, and 8V differ by 200-300 RPM, offering a broad range for testing.

Fan Measurements
Voltage
Noise Level
Speed
12V
24 dBA
1340 RPM
10V
15 dBA
1020 RPM
9V
12 dBA
790 RPM
8V
11 dBA
500 RPM

Fan @ 12V: The fan produces mostly turbulent noise with a bit of a low-pitched drone.

Fan @ 10V: At this level, the noise drops significantly from 24 dBA@1m to 15 dBA@1m. The acoustics are excellent with only a small amount of benign turbulence.

Fan @ 9V: The fan sounds smooth as silk, with almost no bearing noise. At 9V the noise characteristics rival that of the Nexus fan.

Fan @ 8V: Inaudible at one meter's distance.

Overall the fan is excellent just like previous Slip Streams. As far as stock fans go, it is one of the best acoustically.

Cooling Results

Scythe Mugen-2 w/ stock fan
Fan Voltage
SPL@1m
Temp
°C Rise
°C/W
12V
24 dBA
33°C
12
0.15
10V
15 dBA
35°C
14
0.18
9V
12 dBA
38°C
17
0.22
8V
11 dBA
45°C
24
0.31
Scythe Mugen-2 w/ reference 120mm fan
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
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.

The Scythe Mugen-2 performed very well, though suffered noticeably when the fan speed was lowered to about 500 RPM. At 12V the CPU temperature was 12°C above ambient, putting it in league with some of today's top heatsinks. The temperature increased by 2°C at 10V but was accompanied by a sizable decrease in noise — it is fairly quiet and unobtrusive at this level. At 9V, performance degraded by an additional 3°C, and then another 7°C at 8V. The noise the fan generates between 9V and 8V (800~500 RPM) is inaudible unless the environment is almost completely silent.

The stock fan fared well against our reference Nexus fan, an admirable feat. At similar noise levels, the two fans performed within 2°C of one another. There is really no reason whatsoever to consider replacing the included fan.



Previous 1 2 3 4 5 6 7 Next

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