FrostyTech.com Heatsink Reviews and Analysis
      
TOP 5 Heat Sinks     TOP 5 Low Profile Heat Sinks     TOP 5 Liquid Coolers    
 Reviews + Articless     News     HSF Mfg's Index     Advanced Search    

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: 360° View - Cooljag OAK-H2 (JAC84MC) Heatsink

360° View - Cooljag OAK-H2 (JAC84MC) Heatsink
Information on Frostytech's test methodology is available here.

The Heatsink Fan:
The Cooljag OAK-H2 heatsink is built with a 93mm diameter fan. The 7-bladed impeller on this Pulse Width Modulation (PWM) fan spins at 1800-3500RPM when controlled by the computer's BIOS, but when running on a standard 3-pin fan header defaults to a slow speed that seems more like 600-1800RPM. Power is supplied by the 4-pin PWM fan cable which connects to a standard 3-pin or 4-pin motherboard fan header. If you short the blue and yellow pins of a 4-pin PWM fan it will automatically spin up to its maximum RPM as the PWM signal is overruled. For this heatsink, this tweak is highly recommended.

Heatsink Top:
The copper cooling fins are directly below the fan blades, so they should be getting a good solid blast of cool air. The central copper column is 33mm in diameter, hollowed out, and has had its' inside coated black. Each copper fin is 0.4mm thick and spaced 1.0mm apart at the base. The tips are spaced ~2.5-3.0mm apart. A low profile black plastic fan shroud supports the fan and doesn't block in the central void (where heat buildup will occur). The rear of the fan is flush against the plastic support frame, which is unfortunate as it prevents sufficient airflow from occuring behind the fan motor. The body of the heatsink is 89mm across.

Heatsink Side A:
The Cooljag OAK-H2 heatsink stands 68mm high, and the copper portion measures just 37mm of that. The metal clip uses spring tensioned metric screws instead of the standard Intel plastic clips that lock directly into the 4mm motherboard mounting holes surrounding the LGA775 processor socket. The black metal mounting plate shown here (below heatsink) must be positioned behind the CPU socket on the motherboard.

Heatsink Side B:
The plastic fan shroud directs airflow down about 23mm through the cooling fins before allowing it to escape. After which, the warm air exhausts outwards in all directions where it cools adjacent board-mounted components. Most socket 775 Intel motherboards are designed to use this source of airflow, and so VRM and chipset heatsinks are often entirely passive.

Heatsink Base:
The copper base of the Cooljag OAK-H2 heatsink measures 36mm round, but only 29mm of it is useable for making contact with the processors' integrated heatspreader (IHS). The copper is machine turned flat, and quite smooth. Surface roughness is on the order of ~16 microinches, which is considered very good. Note how much of the cooling fins are obscured by the steel mounting clip - there is some clearance given, but we have to wonder if Cooljag could have opted for a better clip here.



 Previous Page °
° Next Page 

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?

Follow Frostytech on FacebookFrostytech News RSS FeedFollow frostytech on Twitter
Resources
° Got Feedback?
° Mk.II Test Platform
° Where To Buy?
° Manufacturer Index
° Industry Dir.
° Cooling Projects

Gelid Tranquillo 4 Air Cooled Heatsink Review

Coolermaster Ergostand III Laptop Cooling Stand Review

Noctua NH-L9x65 Low Profile Heatsink Review

Noctua NH-D9DXi4-3U LGA2011 Xeon Server/Workstation Heatsink Review

Scythe Fuma SCFM-1000 Heatsink

Scythe Ninja 4 SCNH-4000 Heatsink Review
...More Articles >>




Websites you may also like:
PCSTATS

Google Search Frostytech

Time stamped: 9:42AM, 09.21.2019
In Case You Missed it...
°  Thermalright Macho 120 Rev.B CPU Cooler Review

°  Corsair H100i RGB Platinum TR4 Follow Up Review

°  Swiftech H240 X3 AIO processor cooler

°  SilverStone Lucid LD03 Computer Case Review

°  Deepcool Gamer Storm Castle 240EX Review

°  ATS Design Services for Digi-Key Customers




FrostyTech.com
Since June 1999


Find a Heatsink / RSS Feeds
Latest Heatsink Reviews
Top 5 Heatsinks Tested
News RSS Feed
Reviews RSS Feed


Social Media
Facebook
Twitter
Pinterest


FrostyTech.com Info
Feedback
Contact Us / Heatsink Submissions
Submit News
Legal
Suite 66
© Copyright 1999-2019 www.frostytech.com All Rights Reserved. Privacy policy and Terms of Use
Images © FrostyTech.com and may not be reproduced without express written permission.
Current students and faculty of accredited Universities may use Frostytech images in research papers and thesis, provided each image is attributed.