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HDT-SD964 TEST RESULTS
Stock HDT-SD964 Fan
The stock fan was tested for acoustics. We didn't do
a full range of airflow / noise tests, but SPL and RPM measurements were taken
at 8V, 9V, and 12V. As with the 120mm fan on the bigger heatsink, this one is also a PWM fan, and subject to the same voltage/speed non-linearity.
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HDT-SD964 Stock Fan Measurements
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Fan Voltage
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Fan Speed
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Noise Level
|
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12V
|
2750 RPM
|
40 dBA@1m
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9V
|
1230 RPM
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21 dBA@1m
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8V
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600 RPM
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18 dBA@1m
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Cooling Results
| HDT-SD964
w/ stock fan |
|
Fan Voltage
|
Noise @1m
|
Temp
|
°C Rise
|
°C/W
|
|
12V
|
40 dBA
|
35°C
|
14
|
0.18
|
|
9V
|
21 dBA
|
41°C
|
20
|
0.26
|
|
8V
|
18 dBA
|
60°C
|
39
|
0.50
|
|
HDT-SD964 w/
reference fan
|
|
12V
|
21 dBA
|
42°C
|
21
|
0.27
|
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9V
|
19 dBA
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47°C
|
26
|
0.33
|
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7V
|
<18 dBA
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52°C
|
31
|
0.40
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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 SD964, as one would expect with its smaller size and 92mm fan,
could not match the S1283's performance. It did an excellent
job with the stock fan at 12V, but it was too noisy. At 9V, at less than half the full speed, it was much quieter
but still performed very well. This is probably the optimal balance between noise and cooling performance for most silent PC enthusiasts with this HSF. A temperature rise at load of just 20°C is good enough for any system. The result at 8V indicates that the airflow had dipped too low.
The performance with the reference 92mm fan at 9V was excellent, as the noise level here is below the the ambient in most environments. A temperature rise of 26°C is certainly good enough to keep our test CPU under 60°C in any decently configured case. Even the 7V performance is probably good enough, and utterly inaudible in any real application.
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HDT-SD964: Comparables
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Fan Voltage
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Ninja Mini w/ 80mm reference fan
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HDT-SD964 w/ 92mm reference fan
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SI-128 w/ 120mm reference fan
|
|
SPL@1m
|
°C Rise
|
SPL@1m
|
°C Rise
|
SPL@1m
|
°C Rise
|
|
12V
|
20 dBA
|
22
|
21 dBA
|
21
|
22 dBA
|
21
|
|
9V
|
~19 dBA
|
26
|
19 dBA
|
26
|
~19 dBA
|
26
|
|
7V
|
<18 dBA
|
31
|
<18 dBA
|
31
|
<19 dBA
|
29
|
Going through the archives of previously reviewed heatsinks, we found two
coolers that matched up to the SD964's performance: the Scythe Ninja Mini,
and the Thermalright SI-128. The results were very close amongst the three
at similar noise levels, despite the fact that the Ninja
Mini and SI-128 were tested with an 80mm and a 120mm fan, respectively. The SD964's performance is just about
where it should be — equivalent to an excellent 80mm fan cooler or a
dated 120mm fan cooler.
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