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 engineer's straight edge or proven flat surface, in two axes.
Coolermaster's Hyper D92 heatsink has a fairly small mounting base which measures 36x40mm. The base consists of four exposed heatpipes swaged into an aluminum base plate. The surface finish is sanded, with surface roughness of approximately 64 microinches. According to the straight edge the base is perfectly flat in one axis and very slightly wavy in the axis perpendicular to the lay of the heatpipes.
Up next, acoustic sound measurements.
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