| 360° View - Cooljag
SFO-D(18SC) Heatsink Heatsink
Frostytech's test methodology is available
Heatsink Fan: |
The 60x60x25mm fan spins at
a noisy 6800RPM, so
a grill definitely should have been installed onto it. Cooljag looses marks for not doing
this simple measure. The fan itself draws power from a standard 3-pin
motherboard fan header that supports RPM monitoring. Watch out for loose wires
with this puppy!
A plenum roughly 4mm deep is created
by the aluminum fan shroud just behind the 60mm Delta fan.
The upper half of the copper
skived fins are cut back to ease air flow pressure. A total of 27 skived
copper fins are used in this design, with each measuring ~48x58mm. The fins are 0.6mm thick and spaced
about 2mm apart.
Heatsink Side A:
The 60mm Delta fan is mounted on its side,
with one edge of
the fan directly against the copper base plate. There is no airflow below the
fans' frame, which is worrisome as this portion of the base is partially over the CPU
core. The copper base plate is 4mm thick, 5.5mm thick under the skived fins.
Heatsink Side B:
Each of the skived copper fins has a
slight curve to it from the manufacturing process. Fin spacings are wide to present less airflow resistance. Both copper fins and base are made from the same initial bar of material,
which is why skiving can be a very efficient heatsink technology.
The bare copper base plate has been machined
in the x-axis, but is slightly concave in the y-axis (as looking at
the picture to the left). Surface finish is at or better than
a roughness of ~8 microinches.