The Cooljag SFO-H (68YC) goes by a couple model names depending on if it is being sold by CoolJag (JAC68YC), or the parent company Dynatron (SFO-H). Both heatsinks are identical, and what makes the Cooljag SFO-H (68YC) really stand out is its one piece skived copper construction with four milled exhaust ports in the base.
The heatsink is intended for use with socket 754/939/940 AMD Athlon64 and Opteron K8 processors, and comes with a K8 retention frame and packet of silicon thermal compound.
The benefit of skived heatsinks has always been the lack of a thermal joint between the fins and base, since each component is formed from the same block of raw metal. Skiving is a relatively straightforward technique, and it is very similar to the act of hand planning a block of wood except the 'shavings' are shorter and remain attached. The skived fins of the Cooljag heatsink are 34mm in length.
The Everflow fan is temperature controlled so it adjusts its speed from between 3000-6000RPM, moving 21-42CFM in the process. Consequently, noise levels are kept in check when ambient case temperatures are low. Noise can become an issue if the fan is running at full tilt however.
One of the design elements incorporated into the Cooljag SFO-H (68YC) heatsink are four 17x18mm exhaust ports milled from the copper base plate. The spaces allow some airflow from the fan to circulate below the heatsink. Whether or not this is a good design element will become more clear when we examine the thermal test results.
Given the completely copper construction of the Cooljag SFO-H (68YC) heatsink, it's unsurprising to note that it weighs 590 grams.
FrostyTech's Test Methodology is outlined in detail here if you would like to know about the parameters under which this heatsink will be evaluated. Now let's take a closer look at the Cooljag SFO-H (68YC) heatsink, its acoustic characteristics, and thermal test results!
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