Scythe Musashi Dual Fan GPU Cooler [Postcript Added]

Cooling
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TEST RESULTS

Stock Fan Testing

Fan Measurements
Fan Voltage
Fan Speed
SPL@1m
(one fan)
SPL@1m
(both fans)
12V
1770 RPM
24 dBA
27~28 dBA
9V
1350 RPM
17 dBA
21 dBA
8V
1190 RPM
14 dBA
17 dBA
7V
1020 RPM
12 dBA
14 dBA
Fans tested on heatsink blowing downward, placed on foam in open environment.

While the fans included are rated for 2000 RPM, our samples spun slightly slower, topping out at approximately 1800 RPM. Like all Slip Streams, the noise character was very smooth — at high voltages, the acoustics were dominated by air turbulence. The included fan controller had a range of 600 to 1770 RPM, approximately equivalent to 5V~12V. We consider 9V to be quiet for one fan, 8V for both fans.

Noise Level: In System (both fans)
Fan Voltage
SPL@1m*
Side Panel Off
Side Panel On
Side Panel & System On
12V
26 dBA
22 dBA
22 dBA
9V
20 dBA
16 dBA
17 dBA
8V
17 dBA
14 dBA
15 dBA
7V
14 dBA
13 dBA
14 dBA
*measured from the side panel

Inside our P180B case, the side panel blocks out much of the noise generated by the two fans. The noise produced was actually fairly innocuous even at 12V. Our test system is very quiet, at under 20 dBA@1m levels, it added only 1 dB to the system's SPL.

Performance Testing

Test Results: Scythe Musashi
Fan Voltage
SPL@1m
Avg. GPU Temp
Avg. VRM Temp.
CPU Temp.
12V
22 dBA
77°C
130°C
58°C
9V
17 dBA
82°C
144°C
58°C
8V
15 dBA
83°C
149°C
59°C
7V
14 dBA
86°C
156°C
N/A
Grey boxes indicate test failure.

The Musashi performed fairly well, keeping the GPU core at around 80°C at 8~12V. At 7V however the card stopped outputing an image. After some investigation we discovered the cause: the VRMs were overheating. The entire underside of the ATI stock cooler acts as an enormous VRM cooler while the Musashi has only three, small, independent heatsinks. As a result the VRM temperatures were a lot higher than the stock solution, even if the main heatsink was able to cool the GPU core more efficiently.



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