> Because engineering effort is not free. Obviously, but that does not explain why CPU hot swap is inherently expensive. Engineering effort is required to make

> Because engineering effort is not free. Obviously, but that does not explain why CPU hot swap is inherently expensive. Engineering effort is required to make any CPU. Why must the engineering effort specifically relating to CPU hot swap inherently cause architectures that supports CPU hot swap significantly expensive compared to architectures that does not? As a lay man without any experience with actual semi conductors outside of university, I would have thought that this would mostly be something that needs to be designed and specified once and then it could be mass produced. Clearly it will take some effort and you would have to spend some gates on it in the chip design. Considering all the other stuff that are in modern CPUs and chipsets, I would have thought it would be possible to do rather cheaply if mass produced.