> But Apple has a crazy 8 decoders. Not only that but the ROB is something like ... | Hacker News

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		ahupp on Nov 30, 2020 \| parent \| context \| favorite \| on: Why is Apple's M1 chip so fast? > But Apple has a crazy 8 decoders. Not only that but the ROB is something like 3x larger. You can basically hold 3x as many instructions. No other mainstream chip maker has that many decoders in their CPUs. Does this mean I'd expect to see better IPC (instructions per cycle) on these chips vs an x86, due to better memory parallelism?

jonplackett on Nov 30, 2020 [–]

Yes that's that main reason the article gives that a 2.3ghz laptop chip is almost as fast as a 5ghz zen3 chip with a lot more cooling.

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