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Cooljag OAK-H Radial Skived Copper Fin Heatsink Review
Cooljag OAK-H Radial Skived Copper Fin Heatsink Review
  67%   
Abstract: CoolJag's OAK-H heatsink adapts the skived fin technique by turning everything on its side.

 Company link  Category  Published  Author 
Cooljag   Cooling / Heatsinks   Jan 21, 2007   Max Page  
Home > Reviews > Page Title: Intel LGA775 Heatsink Temperature Comparisons

FrostyTech Mk.II Synthetic Thermal Heatsink Test Results
Intel Pentium D / Extreme Edition & Quad Core class heatsinks tested at 150W
Intel Core 2 Duo / Pentium 4 / Celeron class heatsinks tested at 85W

Results based on readings from a 30x30mm copper interface die with 150W and 85W heat loads applied on the LGA775 version of the Mk.II Test Platform. Temperature results listed for each heatsink were calculated by determining the rise over ambient temperatures at time of test. Information on Frostytech's test methodology is available here.
Socket 775 compatible CPU heatsinks
Manufacturer: Model No.: Fan Speed: 150W
Thermal Test* (°C)
85W
Thermal Test (°C)
Noise Level (dBA)

Thermalright Ultra 120 17.8 10.6 53.7
Zalman CNPS9700 LED high 19.0 10.4

56.5

Apack Zerotherm BTF90 21.8 12.7 52.1
Apack Zerotherm BTF80 22.8 13.9 51.9
Thermalfly F1-IACSHA high 29.0 18.3 60.4
Zalman CNPS9500 AT 29.6 17.3 53.3
Alpha Novatech PRE9060M92P high 29.9 18.5 51.5
Akasa AK-961 30.0 18.7

60.7

nPowertek NPH-775-1 30.1 18.8 50.1
Sunon Waturbo 30.6 18.3 57.5
Apack CF800 high 31.4 20.7 48.4
Thermaltake Jungle512 high 31.6 20.4 60.8
Zalman CNPS7700-Cu high 32.9 19.7 50.7
Apack CF900 high 32.9 20.3 48.3
Evercool PT02-9232CP 33.3 19.9 63.3
Zalman CNPS7700-Cu LED high 33.5 20.6 49.8
Intel Stock Pentium D high 33.8 20.7 47.5
nPowerTek SF775-2 high 34.7 21.1 64.6
Akasa AK-960E 36.1 21.4 56.3
Thermalfly I75DUH 37.8 22.8 48.7
Cooljag OAK-H high 38.5 22.9 55.7
Cooljag OAK-H2 high 38.6 24.1 55.6
Intel Stock Pentium D low 40.3 23.9 40.5
Cooljag OAK-H2 low 94.5 51.7 29.2
Cooljag OAK-H low 95.3 54.5 29.5
150W
Thermal Test (°C)
85W
Thermal Test (°C)
Noise Level (dBA)
*Heatsinks are ranked according to the 150W thermal test results column (rise over ambient temp.). Low temperatures with low noise levels are considered best. For reference heatsinks with variable-speed fans, only the high speed (12V) fan test result is included in the comparison sheet; more detailed results reside in each specific heatsink review.

The heat output from Intel processors varies widely between single and multi-core processors, so we've settled on two values which represent the upper limit of both existing CPU families. With a 150W heat load applied by the Intel LGA775 version of FrostyTech's synthetic thermal test platform, the Cooljag OAK-H heatsink yields a rise above ambient temperature of 38.5°C, with 55.7dBA noise. That is a satisfactory result, and virtually identical to the OAK-H2 model in fact. It is not particularly impressive considering the fan is running at its full speed however. At the much quieter fan speed of ~600-1800RPM (fan receiving 6V), temperatures rise dramatically to 95.3°C (29.5 dBA) over ambient with the same heat load. Though running whisper quiet, Cooljag OAK-H heatsink absolutely fails as a low noise cooler just as the OAK-H2 model did.

The Cooljag OAK-H heatsink was also tested with an 85W heat load. With the fan running at 3500RPM the heatsink maintained a very respectable temperature of 22.9°C over ambient. But yet again, when the fan speed was reduced for the second portion of the 85W test, the temperature rose substantially to 54.5°C.

Clearly, the Cooljag OAK-H heatsink is not well equipped to handle heat loads much more than 85W if the fan is not spinning at its fastest speed. With a 150W heat load applied, the heatsink fairs satisfactorily so long as fan speed is maintained at the full 3500RPM rate. The big problem with this is that the Cooljag OAK-H heatsink defaults to its low fan speed when connected to a legacy 3-pin motherboard fan header automatically. Hence, this heatsink is not recommendable for non-PWM motherboards. We would also advise maintaining things at full fan speed if you must use this heatsink, or save yourself $40 and stick with the original stock Intel socket 775 heatsink.

Related Articles:

For more reviews on the latest heatsinks and cooling solutions, rely on FrostyTech's inventory of 350+ heatsink reviews. Here are a few other articles that you might enjoy as well...

- Intel Stock Pentium D Radial Curved non-Bifurcated Fin Heatsink Review
- Thermalfly F1-IACSHA Heatsink Review
- Zalman Fatal1ty FS-C77 Heatsink Review
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- Verax Helado PWM-T Low Noise Heatsink
- Apack ZeroTherm BTF80 Heatsink Review
- Apack ZeroTherm BTF90 Copper Heatsink Review



 Previous Page °
Heat Sink Review Index  

Table of Contents:

 1:  Cooljag OAK-H Radial Skived Copper Fin Heatsink Review
 2:  360° View - Cooljag OAK-H Heatsink
 3:  Acoustic Comparisons and Base Surface Quality
 4: — Intel LGA775 Heatsink Temperature Comparisons

List all Cooljag heat sinks that Frostytech tested?

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