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Zalman CNPS9900 MAX Fan Measurements
The CNPS9900 MAX is equipped with an 11-blade, translucent red LED fan with a width equivalent to a frameless 140 mm case fan. It is rated for 1700 RPM and 30 dBA ± 10%.
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Stock Fan Measurements
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Voltage
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Avg. Speed
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SPL@1m
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12V
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1600 RPM
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32~33 dBA
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9V
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1260RPM
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26~27 dBA
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7V
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1000 RPM
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20 dBA
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6V
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850 RPM
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16 dBA
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5V
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680 RPM
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13 dBA
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Measuring mic positioned 1m at diagonal angle from
the center of the heatsink.
Ambient noise level: 10~11 dBA.
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At higher speeds the fan was very whiny but at 1000 RPM and below the acoustic profile mellowed out considerably. It had a bit of a hum at 7V but at 5V~6V, all we could hear was turbulence. It was very quiet and pleasantly smooth with almost no tonal elements. Overall, it's a huge improvement over previous fans from the CNPS7000/8000/9000 series.
The MAX ships with a RC7P fan adapter which lowered the fan speed to only 1420 RPM (the speed reached at ~10.5V). We're puzzled as to why, as the adapter has almost no practical value.
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At 6V, the MAX's stock fan's noise output was mainly broadband with little to no tonality.
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Zalman CNPS5X SZ Fan Measurements
The CNPS5X is equipped with a 7-blade fan with a width equivalent to a frameless 92 mm case fan. It is rated for 2800 RPM ± 10% and 32 dBA ± 15%.
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Stock Fan Measurements
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Voltage
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Avg. Speed
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SPL@1m
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12V
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2700 RPM
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34~35 dBA
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9V
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2150 RPM
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29 dBA
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7V
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1600 RPM
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21~22 dBA
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6V
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1340 RPM
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18 dBA
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5V
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1070 RPM
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14 dBA
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Measuring mic positioned 1m at diagonal angle from
the center of the heatsink.
Ambient noise level: 10~11 dBA.
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Though Zalman claims that the CNPS5X stock fan has fluid bearings, it sounded a lot like ball bearings to us. It was loud and whiny at 12V, and droned at 9V. It did not become quiet until it reached about 6V, and even then there was a low pitched hum being generated. Luckily this was only audible at close proximity, the overall noise character was reasonable at greater distance.
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At 6V, the CNPS5X stock fan had some distinct undesirable tonal elements.
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