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.
The nickel plated copper heatspreader on the base of Cryorig's H5 Ultimate heatsink measures 38 x 42mm in size and 2-6mm thick. The metal has a smooth machined surface finish. Surface roughness is at or better than ~32 microinches. Compared against an engineer's straight edge, the base of the Cryorig H5 Ultimate is very slightly convex in the direction perpendicular to the heatpipes.
The slight convex curve of the base is visible in the pattern left by thermal compound squeeze out after being installed on Frostytech's synthetic thermal test platform.
Sound level measurements are coming up next on Frostytech...
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