Base Finish and Flatness
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 copper base plate of NZXT's Kraken X60 waterblock has a machined finish with a surface roughness of approximately ~16 microinches. The manufacturer ships it with a pre-applied circle of grey thermal compound (removed for the above photo). The copper base plate is very slightly convex in both axes.
Next, acoustic measurements and then AMD and Intel synthetic thermal test result charts.
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