That's essentially what vapor chamber coolers are. It's a sealed unit where the working fluid evaporates on the CPU end, absorbing a ton of heat, and then conde

That's essentially what vapor chamber coolers are. It's a sealed unit where the working fluid evaporates on the CPU end, absorbing a ton of heat, and then condenses on the other side, before going back to do the cycle again. Because the heat of vaporization is so large, these can move a lot more heat than ordinary heat sinks.