The Arkua 728M-7N01
is an extruded aluminum heatsink with a 19mm diameter copper slug
running through the core. The copper center provides
a more thermally conductive material to better disperse the thermal energy absorbed from
the processor to the surrounding aluminum fins which radiate out
from the center.
of the copper slug is exposed, but is below
part of the clip assembly so all the cooling is accomplished by the aluminum
fins. The clip is designed in such a way that the force is
applied directly to the center of the processor core. Earlier heatsinks
applied the force to the center of the
heatsink body instead.
The extrusion pattern Arkua employ has several benefits that typical impingement heatsinks lack;
the most significant of which is the benefit of exhaust airflow
to further cooler the processor directly. The aluminum fins are rather
thick be necessity, but the surface is rippled to help introduce turbulence
into the system.
At the very bottom of the heatsink, the copper core lies
protected with a metallic thermal interface pad - what material this is we're
not 100% certain