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Cooljag OAK-H2 (JAC84MC) Radial Skived Fin Heatsink Review
Cooljag OAK-H2 (JAC84MC) Radial Skived Fin Heatsink Review
  67%   
Abstract: On the plus side, the central copper column makes direct contact with the CPU core, and the skived component which is soldered on to it radiates the heat out into the surroundings so the thermal pathway is pretty direct.

 Company link  Category  Published  Author 
Cooljag   Cooling / Heatsinks   Jan 21, 2007   Max Page  
Home > Reviews > Page Title: Acoustic Comparisons and Base Surface Quality

Acoustic Samples: Listen to this Heatsink!

The Cooljag OAK-H2 heatsink is nearly inaudible when it's fan runs at the ultra low speed of something along the lines of 600-1800RPM, and the down side to this is that level of airflow is completely impractical for this heatsink geometry. The PWM fan is controlled by the BIOS so it is very quiet at its lowest RPM, and moderately loud at full speed (1800-3500RPM). To listen to this heatsink in operation at its lowest fan speed, click on the little headphones icon below and play the sample MP3 files.

FrostyTech Acoustic Sampling Chamber - Low Speed
Standard Waveform view of a 10 second recording. Click on the headphones icon to listen to an MP3 recording of this heatsink in operation. The fan is rotating at an estimated 600 RPM

Sound Level Measurements: Which Heatsink is Quietest?

Listening to the actual noise a heatsink makes allows you to hear what pure numbers alone cannot get across. To further emphasize FrostyTech's reliance on cold hard facts when evaluating a heatsink, we also take noise level measurements with a sound level meter.

FrostyTech Heatsink Noise Level Measurements
Noise level Decibel measurements of each heatsinks' fan in operation are taken with the aid of a sound level meter and sound isolating enclosure. The values may be higher than the mfgr's listed specs, but are directly comparable to one another. Measurements are made on the dB (A) scale, lower values are best. Information on Frostytech's test methodology is available here.
Manufacturer: Model No.: Fan* Speed: Noise Level (dBA): CPU** Platform

Cooljag OAK-H2 low 29.2 dB Intel
Verax Quattro 1 low 30.9 dB Intel/AMD
Verax Helado 36.3 dB Intel/AMD
Thermalfly I75DUB 38.7 dB Intel
Intel Stock Pentium D low 40.5 dB Intel
Coolermaster Hyper48 43.6 dB Intel/AMD
Zalman CNPS7000B-CU high 44.9 dB Intel/AMD
Noctua NH-U12 45.4 dB Intel/AMD
Scythe Shogun high 45.9 dB Intel/AMD
Intel Stock Pentium D high 47.5 dB Intel
Apack CF900 high 48.3 dB Intel
Apack CF800 high 48.4 dB Intel
Thermalfly I75DUH 48.7 dB Intel
Spire SP601B3 48.9 dB Intel/AMD
Zalman CNPS7700-Cu LED high 49.8 dB Intel/AMD
nPowertek NPH-775-1 50.1 dB Intel
Zalman CNPS9500 LED high 50.3 dB Intel/AMD
Gigabyte 3D-Rocket 50.7 dB Intel/AMD
Zalman CNPS7700-Cu high 50.7 dB Intel/AMD
Alpha Novatech PRE9060M92P high 51.5 db Intel
OCZ Tempest 51.6 dB Intel/AMD
Apack Zerotherm BTF80 51.9 dB Intel/AMD
Apack Zerotherm BTF90 52.1 dB Intel/AMD
Zalman CNPS9500 AT 53.3 dB Intel
Thermalright Ultra 120 53.7 dB Intel/AMD
Verax Quattro 1 high 55.4 dB Intel/AMD
Cooljag OAK-H2 high 55.6 dB Intel
Akasa AK-960E 56.3 dB Intel
Zalman CNPS9700 LED high 56.5 dB Intel/AMD
Zalman FS-C77 56.5 dB Intel/AMD
Gigabyte 3D Rocket-Pro high 56.7 dB Intel/AMD
Zalman CNPS8000 high 57.4 dB Intel/AMD
EKL V8 high 57.5 dB Intel/AMD
Sunon Watrubo 57.5 dB Intel
Antazone AS-C1000 57.6 dB Intel/AMD
Noctua NH-U9 58.4 dB Intel/AMD
Coolermaster Aquagate Mini high 59.2 dB Intel/AMD
Thermalfly F1-IACSHA high 60.4 dB Intel/AMD
Akasa AK-961 60.7 dB Intel
Thermaltake Jungle512 high 60.8 dB Intel
Gigabyte 3D Cooler-Pro high 62.5 dB Intel/AMD
Gigabyte 3D Cooler-Ultra high 63.0 dB Intel/AMD
Evercool PT02-9232CP 63.3 dB Intel
nPowertek SF 775-2 high 64.6 dB Intel
Gigabyte GH-PCU23-VE high 65.6 dB Intel/AMD
ASUS Starice high 67.4 dB Intel/AMD
Thermalfly I75DUB high 68.5 db Intel
Gigabyte G-Power Pro high 71.9 dB Intel/AMD
Noise Level (dBA)

*Unless noted, for reference heatsinks with variable-speed fans only the 'high speed' (12V) fan noise measurement is included in the comparison sheet; more detailed results for the low fan speed (~5V) tests reside in each specific heatsink review. ** 'AMD' denotes compatibility with socket 754/939/940 & AM2 processors where applicable. 'Intel' denotes compatibility with socket 775 platform.

With its 93mm fan spinning at a very conservative 600-1800RPM, the Cooljag OAK-H2 heatsink generates 29.2 dBA. By way of comparison, the stock Intel thermal solution produces about 40.5 dB at its quietest speed. The Cooljag OAK-H2 may be quiet when its fan is barely turning, but we do not recommend you run it under these conditions - if you have a 3-pin fan header, find short length of wire to short the blue and yellow wires of the fan's power cord so it rotates at full speed. If you don't, your CPU may likely overheat.

Surface Finish and Flatness

Surface finish is an important factor that we all look for when holding a new heatsink. Flipping a cooler over to see how well the base has been machined is a quick way to judge the attention to detail that was put into making it. The following test involves the use of a Surface Roughness Comparator, which offers a concise cross section common machine surface finishes.

The Cooljag OAK-H2 heatsink has a surface roughness of approximately 16 microinches, which is considered very good. Next, let's see how this heatsink handles the heat compared to a selection of other heatsinks!



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Table of Contents:

 1:  Cooljag OAK-H2 (JAC84MC) Radial Skived Fin Heatsink Review
 2:  360° View - Cooljag OAK-H2 (JAC84MC) 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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