Kmpkt, I'm reading those now.
so it says that e.g. 63 watts requires an 8mm heatpipe. But what if you're using 8 heatpipes; must it still be 8mm?
And it looks like 8mm heatpipes have a huge performance boost if they're vertical with the heat-source at the bottom.
And a 6mm pipes is twice as good as a 3mm, but an 8mm is more than twice as good as a 6mm. So 8mm seems to be where it's at.
So if you have a motherboard with the CPU (or GPU) on the lower part of a vertical case, connected to a heat-sink higher up, with multiple 8mm heatpipes, you'd get very good heat transfer.
I wonder why we always see round and flat heat-pipes - how about square or triangular? Then we could stack them. 
Reading the other links now... I remember reading these before. I'm starting to go in circles with my ideas about heat transfer.
Here's the same site talking about vapor chambers,
http://celsiainc.com/vapor-chamber-one-piece-design/
I would attach one of these to my hot-spots, and solder fins directly onto the vapor-chamber.
Something like that curved one above could allow you to cover the entire motherboard in vapor-chamber goodness, with fins stuck on, you'll have a very Frankenstein, but very powerful and relatively small computer.
^^ My case is 1 big vapor chamber.
