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Lots of folks forget that Apple tried some fancy cooling tech in the immediately pre-Intel Mac Pros. Didn't end well... leaks, etc. And those weren't portable machines subjected to a lot of handling and banging-around. (As in, hell-to-the-no were those beasts portable in any way... immense, backbreaking tanks, they were. Lordy they were hunky-built. Works of art. But still they piddled.)

Now, those used liquid-based coolers, but I'd imagine that a vapor chamber would be regarded with great suspicion by Apple for the same reason, based on bitter experience. Especially in a portable device. Where the tech might not fit in the first place, incidentally.

Having said that, I use my high-spec 2018 MBP to run virtual machines. This is usage that really pounds the CPU. Yet the machine runs smoothly even with more than one VM active at a time. Best machine I've used for VMs, in fact. Unbelievably powerful. My point: no throttling is perceptible even in my extreme usage. To my eye, the whole issue is over-cooked, no pun intended.
 
Now, those used liquid-based coolers, but I'd imagine that a vapor chamber would be regarded with great suspicion by Apple for the same reason, based on bitter experience.

Heat pipes are also two-phase cooling systems, with liquid inside. Vapor chamber just has a different shape, but the principle of heat transfer is the same, evaporate and condensate.
 
From my understanding they're more bigger and provide a larger area of cooling. They're more efficient at thermal management then heat pipes.
That's right, larger surface area where the phase change takes place so for a given heatsink size vapor chamber will outperform heat pipes, but by not as much as the size difference would suggest, because you're still limited by the die surface area.
 
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