A few interesting facts from Dan's Data
 

Heat pipe and wicks, 65536? relative to PC, $NtUninstall - do they mean anything to you. Take a read. -- Wicked heat pipes aren't as efficient in the vertical orientation as unwicked ones, and wicked pipes also do, indeed, often work not quite as well if they're horizontal or upside down. But the difference isn't large (at least, not for CPU cooling purposes, which are pretty low performance), and there's no liquid-lock problem