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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 engineer's straight edge or proven flat surface, in two axes. The base of Scythe's Mugen Max heatsink consists of a 2mm thick sheet of nickel plated copper soldered onto the six semi-flattened heatpipes. The copper looks to have been punched from sheet stock, before being plated. The surface finish is very smooth, surface roughness at or better than ~8 microinches. When compared to an engineer's straight edge however, the Mugen Max base is convex in both axes.
Here's a shot of the base of the Mugen Max heatsink after it was tested on one of Frostytech's synthetic thermal test platforms. Two things are remarkable about this; although only a small area made good contact with the flat copper interface die and nearly half the heatsink base was effectively out of contact (as evidenced by the undisturbed thermal compound), the base plate is well soldered to the heatpipes and acted as it was designed, spreading heat laterally. It's not ideal, but given how little of the heatsink was in contact with the heat source, the thermal performance it did achieve is kind of impressive. Sound level measurements are coming up next on Frostytech...
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