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A flat contact area between the heatsink and CPU heatspreader
is ideal for heat transfer. The copper heatspreader that covers a modern desktop
CPU die often has a slightly concave shape; that is, the center is slightly
lower and the surface gradually curves upwards toward the edges. Heatsink manufacturers
can either make their bases flat, slightly convex to match the concave surface
of the processor.
A Czech tech website, CTTL.cz
found that their Ninja 3 sample had a rather poor base. We replicated their
observations by placing a visibly straight metal ruler against the base of the
Ninja 3 and several other heatsinks with a bright light source in the background
to see how much light leaked through.
On the Ninja 3, light was visible along the entire surface except at the far
edges. The base is concave with a shallow but noticeable crater effect. Most
coolers have bases that are almost flat or contoured slightly in the opposite
direction. When the ruler was placed on the Yasya's base, more light was visible
at the edges, and the ruler could rock up and down slightly with the center
as a pivot point.
The original Ninja, Thermalright Ultra-120 eXtreme, and Prolimatech Mega Shadow
(Megahalems) have clearly
convex surfaces as well.
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