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TEST RESULTS
Noise
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Stock Fan Measurements
(in system)
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Fan Voltage
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SPL@1m
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12V
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24 dBA
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9V
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19 dBA
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7V
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16 dBA
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5V
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14 dBA
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Ambient noise level: 11 dBA
(14 dBA with the test system on)
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The Accelero Xtreme's fans were fairly quiet below 9V, and effectively inaudible at 5V in our two fan VGA test system. The fans sound remarkably smooth and soft, though it develops a small degree of whine above 9V and turbulence about 10V. At 8V and below, the acoustic profile is completely benign and innocuous.
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The Accelero Xtreme Plus measured 16 dBA@1m at 7V in our VGA test system.
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The wave form showed a lot of noise at lower frequencies, but this was caused mainly by the other components in the test system. The contribution from the Xtreme plus had higher frequencies in the 400 to 900 Hz range, but it was not enough to subjectively alter the overall sound quality of the machine.
Performance
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Test Results on OC'd 215W Radeon HD 5870
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Fan Voltage
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SPL@1m
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GPU Temp
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VRM Temp
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System Power (AC)
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Stock Cooler
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Auto
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34 dBA
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87°C
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unknown
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415W
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GELID Icy Vision
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12V
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27 dBA
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87°C
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100°C
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399W
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9V
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23 dBA
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90°C
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108°C
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403W
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7V
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21 dBA
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91°C
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113°C
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405W
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5V
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17 dBA
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fail, throttle
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AC Accelero Xtreme Plus
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12V
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24 dBA
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66°C
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96°C
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386W
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9V
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19 dBA
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67°C
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106°C
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386W
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7V
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16 dBA
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68°C
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115°C
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387W
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5V
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14 dBA
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82°C
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147°C
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402W
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Ambient temperature: 23°C
Ambient noise level: 11 dBA
(14 dBA with the test system on)
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The best dual fan cooler we've tested, the GELID Icy Vision was absolutely destroyed by the Accelero Xtreme Plus. Though it is a big improvement over the stock cooler, the GELID was simply outclassed by the three-fan Arctic Cooling behemoth. At similar noise levels, the Xtreme Plus delivered massive improvements in GPU and VRM temperatures, about 24°C and 12°C respectively.
At 5V/17 dBA, the Icy Vision wasn't able to keep the GPU cool enough and we saw the card's clock speeds throttle in response. With the Xtreme Plus, the 5870 remained stable with the fans at 5V, a level that generated no measurable noise increase in our test system, though the VRM temperature was quite high. Cooling a 215W card while remaining essentially inaudible is simply astonishing.
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