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Base Finish and Flatness Flipping a heatsink over to inspect the business end is often a simple indicator of overall cooler quality. More practically speaking, a heatsink is in many ways only as effective as the contact it makes with the processor - the flatter and smoother the better. Base finish is one of the criteria that Frostytech measure in the course of evaluating heatsinks, and it involves two distinct aspects. Surface Finish is the first; this is calculated with the aid of Surface Roughness Comparator that has a cross section of common machine surface finishes and their numerical surface roughness equivalents in microinches. The second is Surface Flatness. This is tested with an engineers straight edge or proven flat surface, in two axis. Coolermaster's Aquagate Mini R80 waterblock is constructed from cast copper. The 40mm diameter copper base plate that makes contact with the processor has been machined very smooth and is perfectly flat in both axis. Surface roughness is approximately ~16 microinches. As you can see in the pictures above, the mounting brackets for each CPU platform screw directly into the copper pad. Acoustic measurements are next, and then it's on to the thermal test reports!
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