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 Apack Zerotherm ZF120 heatsink has a machined copper base with a surface roughness of approximately ~16 microinches. The surface is polished smooth, and flat in both axis. The four screw holes around the outside of the base area allow Intel and AMD mounting brackets to be attached.
Next, let's see how this heatsink handles the heat compared to a selection of other heatsinks!
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