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Here is the Ninja, on its side.
There are a total of 12 copper heatpipes that come up from the
copper base. Scythe describes it as 6 heatpipes; presumably they are U-shaped.
Whether it is 6 or 12 is a moot point: There are 12 heatpipe lengths
which wick the heat away from the base up into the aluminum fins. There are
24 aluminum fins in total, well spaced for good airflow even at slow rates.
Any tighter, and fanless operation would not be possible because of the impedance
to airflow.
You will notice two rows of notches along the edges of the fins,
on each face. It's easier to see than to explain, in the photos and above. These
notches are meant to act as hooks for wire clips that can hold a 120x25mm fan
against any side.
View from top. Note two notches on each side, for a total of eight on each
fin.
Fan clipped on one side...
...from another angle.
The deep notches that extend in from each corner of each aluminum
fin are worthy of note. They are there to help reduce airflow impedance. This
is important because of the large dimensions of each fin. It is difficult for
air to flow more than a couple of inches through a restricted space, especially
when the static pressure of the fan is low, as would be the case when a fan
is spinning slowly or only rising air from convection is employed.
Note that the wire clips hook the fan and press it up against the edges of the finds to keep it in place. This means that the fan can only be mounted with its central frame against the fins, blowing into the HS rather than sucking out.
On many motherboards, mounting the fan to blow across the HS and out towards the back panel vent or fan means the fan's bottom edge must sit atop the first bank of memory sticks. It may require than the fan's vertical position vis-a-vis the HS be adjusted so that it sits a little higher than pictured above. This is easily achieved, as the wire hoots are quite versatile, if a bit flimsy. The wire does not have to catch on every HS fin notch, which is how you can position the fan to clear the memory. In practice, no problems were encountered just letting the bottom of the fan rest on the top edge of the memory.
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