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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. The base of the Xigmatek HDT-SD964 heatsink has a roughness of approximately 32 microinches, which is considered good. The base itself has a smooth sanded finish that is generally flat in both axis. There are eight small voids created where the copper heatpipes meets up with the aluminum mounting block. These serve a positive use when the heatsink is clamped down by allowing excess thermal compound to evacuate itself from between the heatsink and processor.
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