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TEST RESULTS
Stock Fan Testing
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Fan Measurements
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Fan Voltage
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Fan Speed
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SPL@1m
(one fan)
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SPL@1m
(both fans)
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12V
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1770 RPM
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24 dBA
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27~28 dBA
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9V
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1350 RPM
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17 dBA
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21 dBA
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8V
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1190 RPM
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14 dBA
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17 dBA
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7V
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1020 RPM
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12 dBA
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14 dBA
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Fans tested on heatsink blowing downward, placed
on foam in open environment.
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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.
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Noise Level: In System (both fans)
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Fan Voltage
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SPL@1m*
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Side Panel Off
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Side Panel On
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Side Panel & System On
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12V
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26 dBA
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22 dBA
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22 dBA
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9V
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20 dBA
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16 dBA
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17 dBA
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8V
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17 dBA
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14 dBA
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15 dBA
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7V
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14 dBA
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13 dBA
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14 dBA
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*measured from the side panel
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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
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Test Results: Scythe Musashi
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Fan Voltage
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SPL@1m
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Avg. GPU Temp
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Avg. VRM Temp.
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CPU Temp.
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12V
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22 dBA
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77°C
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130°C
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58°C
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9V
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17 dBA
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82°C
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144°C
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58°C
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8V
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15 dBA
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83°C
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149°C
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59°C
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7V
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14 dBA
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86°C
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156°C
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N/A
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Grey boxes indicate test failure.
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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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