StaticPressure
Things are not that simple. actually. Look closely at fins that are designed for press-fitting and you'll notice "bottlenecks" around heatpipe holes that widen the contact area. Orochi uses a different (cheaper?) technique of fitting fins that prohibits making these "bottlenecks" - otherwise it will be impossible to drag the fins (pre-stacked) on. That's why they use soldering - to compensate the losses.
As for combining "bottlenecks" and soldering - I can say that technologically it's a complete PITA that leads to a very little improvement in terms of cooling capacity. Just isn't worth the trouble.
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