Xigmatek HDT-S1283 & SD964 "heatpipe direct-touch" CPU coolers

Cooling
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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.

HDT-SD964 Stock Fan Measurements
Fan Voltage
Fan Speed
Noise Level
12V
2750 RPM
40 dBA@1m
9V
1230 RPM
21 dBA@1m
8V
600 RPM
18 dBA@1m

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
9V
19 dBA
47°C
26
0.33
7V
<18 dBA
52°C
31
0.40
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.

HDT-SD964: Comparables
Fan Voltage
Ninja Mini w/ 80mm reference fan
HDT-SD964 w/ 92mm reference fan
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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