We expect that, like the A-series chips in iPhones, iPads, and Apple TVs, Apple's Mac processors will be completely custom. This is all a way of saying that "ARM transition," while a convenient shorthand, doesn't fully describe what we expect to happen with upcoming Macs.
Theoretically, Apple could license x86, the instruction set architecture used in processors from Intel and AMD, and build custom desktop and laptop chips that way, but the team is by now versed in ARM, and chips made with the ARM instruction set are known for their lower power consumption compared to x86. The company's work is completely custom, rather than a repackage of ARM processors. Apple designs its own CPUs and CPU cores that implement ARM instruction sets. This is how Apple does what it does with its A-series systems-on-chips, and the distinction here is crucial. Apple's chips, while they use the ARM instruction set, are all completely custom.
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