It seems that the shift to ARM chips might not be too far off, at least according to AnandTech who recently reviewed Apple’s iPhone Xs and Xs Max, where they found that based on benchmark scores, the new A12 Bionic chipset in the new iPhones are actually not too far off from desktop-level CPU performance.
According to AnandTech’s Andrei Frumusanu, “What is quite astonishing, is just how close Apple’s A11 and A12 are to current desktop CPUs. I haven’t had the opportunity to run things in a more comparable manner, but taking our server editor, Johan De Gelas’ recent figures from earlier this summer, we see that the A12 outperforms a moderately-clocked Skylake CPU in single-threaded performance.”
This isn’t to say that the A12 can power a PC or is as good as a desktop-level CPU. Frumusanu admits that these benchmarks weren’t run in a comparable manner, and there are other factors such as compiler complications and frequency concerns to take into consideration. However based purely on the numbers, it seems that the concept of an ARM-powered MacBook might not be too far off from being made a reality.