Prolima Megahalems: A Mega Nehalem Cooler

Cooling
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TEST RESULTS

Provided Fan Testing

The fan provided by Prolimatech looks like a typical seven-bladed 120mm case fan. It was a bit mysterious though as there were no identifying marks and no case fans are listed on the Prolimatech website. It is possible that the "suggested" fan specifications on the main Megahalems product page describe this fan, but this is just a guess.


Brand Prolimatech Power Rating Unknown
Model Number Unknown Airflow Rating Unknown
Bearing Type Unknown RPM Rating Unknown
Hub Size 1.54" Noise Rating Unknown
Frame Size 120 x 120 x 25 mm Header Type 3-pin
Weight 110 grams Start Voltage 2.4V

TEST MEASUREMENTS
Voltage
SPL @ 1m
Speed
12V
20 dBA
1120 RPM
9V
16 dBA
920 RPM
7V
13 dBA
780 RPM
5V
12 dBA
590 RPM

Fan @ 12V: At full speed, the fan was turbulent and had a bit of drone. The measured sound pressure level was 20 dBA, low, at least compared to the average case fan.

Fan @ 9V: Much of the turblence disappeared, resulting in a 4 dBA decrease. With the airflow turbulence lowered, we noticed a high degree of clicking coming from the fan's motor.

Fan @ 7V: The fan sounded very much like the 9V level. The clicking of the fan's motor/bearings became more noticeable despite it being quieter overall.

Fan @ 5V: Smooth at a distance, but up close the clicking sounded more like a rattle.

Overall the fan is fairly quiet, but it is far cry from the much smoother, high quality fans we prefer. It's an average low/mid airflow fan with unremarkable acoustics.

Cooling Results

Prolimatech Megahalems w/ provided 120mm fan
Fan Voltage
SPL@1m
Temp
°C Rise
°C/W
12V
20 dBA
30°C
10
0.13
9V
16 dBA
31°C
11
0.14
7V
13 dBA
34°C
14
0.18
5V
12 dBA
39°C
19
0.24
Prolimatech Megahalems w/ reference 120mm fan
12V
16 dBA
30°C
10
0.13
9V
13 dBA
34°C
14
0.18
7V
12 dBA
37°C
17
0.22
5V
11 dBA
40°C
20
0.26
Load Temp: CPUBurn for ~10 mins.
°C Rise: Temperature rise above ambient (20°C) at load.
°C/W: based on the amount of heat dissipated by the CPU (measured 78W); lower is better.

Overall the Megahalems was a very impressive performer, delivering some of the best results we've ever seen. Both fans kept thermal rise above ambient below 20°C, even at 5V. The provided fan's sweet spot seemed to be 7V, while our reference Nexus fan performed proportionally depending on the fan voltage. The Nexus fan delivered slightly improved results at equivalent noise levels, but only by a single degree on average — nothing to write home about.

°C rise Comparison: Prolimatech Megahalems vs. Competitors
Heatsink
Nexus 120 fan voltage / SPL @1m
12V
9V
7V
5V
16 dBA
13 dBA
12 dBA
11 dBA
Scythe Ninja 2
17
18
20
23
Xigmatek HDT-S1283
13
15
18
22
Thermalright U120E
12
14
17
24
Noctua NH-U12P
14
16
17
21
Thermalright HR-01+
13
15
16
20
Prolimatech Megahalems
10
14
17
20
All results generated with our reference Nexus 120mm fan.

The Prolimatech Megahalems's performance was top-notch across the board. It posted similar results to the Thermalright HR-01 Plus and Noctua NH-U12P with low airflow, and bested the entire field, even the Thermalright Ultra-120 eXtreme, when our Nexus fan was set to 12V.



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