WWDC 2020: Apple's silicon bet.

Apple announced the architecture transition on Monday. The Mac is moving off Intel and onto Apple's own ARM-based silicon. The first machines ship by the end of the year; the transition is supposed to be complete within two. Tim Cook called it 'a historic day for the Mac'. He's right — but the historic part isn't the announcement itself. It's that Apple has done this exact thing twice before, and both times it worked.

Apple's transition history

Why this is actually a big deal

• 01Apple has been designing world-class chips for the iPhone and iPad for a decade. The A-series is already faster than most laptop CPUs by per-core measures.
• 02The Mac has been thermally constrained by Intel's roadmap for years. The MacBook Pro fan noise is a chip-design problem, not an Apple-design problem.
• 03Unified memory architecture (CPU and GPU sharing one pool) changes the kind of workloads laptops can handle.
• 04Vertical integration — Apple owns the chip, the OS, the dev tools, the apps. They can optimise across boundaries that nobody else can.
• 05Performance per watt — the killer metric. Intel's mobile chips are years behind Apple's A-series by this measure.
• 06Apple controls the timing. No more 'waiting for Intel to ship a faster part'.

What about the existing Mac stack?

• 01Rosetta 2 is the translation layer. Apple says it's good. Apple usually means it when they say that — but real-world performance is the test.
• 02Xcode produces 'Universal Binaries' so apps can target both architectures from one project. A familiar move from the PowerPC-to-Intel transition.
• 03Most developer tooling — Node, Docker, Homebrew, language runtimes — needs to be recompiled. Expect a rough six months.
• 04Boot Camp goes away. Running Windows natively on a Mac stops being a thing. Parallels via virtualisation will be the new answer.
• 05iOS apps will run natively on macOS — a side-effect of the shared architecture. This is a smaller deal than it sounds in practice.

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If the chip is half as good as the rumours suggest, the Mac is about to have a five-year head start over the rest of the laptop industry. The industry has no answer to vertical chip design at this scale yet.

What we'll do at the studio

• 01Hold the existing Intel Macs for another year. We've just refreshed.
• 02Buy one DTK (developer transition kit) to start testing our toolchain.
• 03Buy a real M1 Mac whenever it ships, primarily to flush out edge cases in our build pipeline.
• 04Avoid committing to a single-architecture stack until we see how Rosetta 2 performs at production scale.
• 05Test every client production build on both architectures during the transition window.
• 06Keep at least one Intel machine around for the long tail — there'll be legacy tooling that takes years to migrate.

Risks to the transition

• 01Pro app vendors (Adobe, Autodesk, Avid) move slowly. If Adobe takes two years to ship native Apple Silicon, half the creative industry stays on Intel.
• 02Docker performance — running Linux containers under emulation is the obvious pain point.
• 03Gaming. The Mac gaming story was thin under Intel; ARM makes it thinner before it gets better.
• 04x86-only enterprise software with no ARM build will take years to migrate (or never will).
• 05Initial M1 chips may be excellent for laptops but underwhelming for desktops — the Mac Pro story is the last unsolved problem.

It's the most ambitious thing Apple's announced since the iPhone. If the chip is half as good as the rumours suggest, the Mac is about to have a five-year head start over the rest of the laptop industry. We'll see by December. Until then, the smart play for studios is curious-but-cautious: watch the launch, test the chip, hold the migration.