Smallish LGA775 Heatsink Roundup - Part 2

Cooling
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Cooler Master Geminii S - $35USD

We wouldn't call the Geminii S a compact cooler, but it is smaller than the NT06-E with a fan. It is also short enough to fit in some cases that most third party heatsinks will not (such as the Luxa2 LM100).


The Geminii S and included accessories.



At 86 mm tall and weighing in at 500 grams, it isn't exactly a light weight. Its shape is reminiscent of the formidable Noctua NH-12CP. It sports 5 heatpipes and ships with a 120 mm fan. The fins are extremely thin at 0.28 mm, and are spaced 1.6 mm apart on average.



To mount the Geminii S, bolts are screwed tight into the mounting arms before they are installed. The threads on the bolts are reversed, that is they are tightened by turning counterclockwise.



The bolts are secured to a backplate on the other side with nuts. The nuts tighten in the traditional way (clockwise), so the nuts and bolts will never get stuck together and rotate together if one side becomes loose.



Mounted on our test platform.


Test Results (stock fan)
Fan Voltage
Fan Speed
SPL@1m
Thermal Rise
°C/W
12V
1930 RPM
30 dBA
16°C
0.21
9V
1530 RPM
24 dBA
18°C
0.23
7V
1200 RPM
20 dBA
21°C
0.27
5V
800 RPM
14 dBA
29°C
0.37
Test Results (reference fan)
12V
1100 RPM
16 dBA
21°C
0.27
9V
890 RPM
13 dBA
25°C
0.32
7V
720 RPM
12 dBA
32°C
0.40
Thermal Rise: Temperature rise above ambient at load.
°C/W: based on the amount of heat dissipated by the CPU (measured 78W); lower is better.

The fan included with the Geminii S was surprisingly good, rivaling the acoustic qualities of Scythe and Nexus fans. At 12V and 9V, it was turbulent but smooth. At 7V it developed a bit of a buzz that was only audible close-up, but sounded completely benign at 1m. At 5V it was inaudible.



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