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How does macOS manage virtual cores on Apple silicon?
(eclecticlight.co)
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this post was submitted on 23 Oct 2023
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It's worth noting that Apple's partnership with ARM goes back to the 1980's and included both resources and people all the way back to then (from memory I think the first CEO of ARM was an Apple employee). Your OnePlus 2 has efficiency cores because of Apple's investment in that architecture.
But this article is about Macs, not phones. Some Apple Silicon Macs would only last about 2 minutes if they ran on the battery in your OnePlus 2, and the "efficiency cores" aren't really there to reduce power consumption... it's more about producing less heat.
For example the M2 cores are more than capable of running high end PC games, and because they generate almost no heat at all even under full load you can push the GPU much harder than you could if the performance cores were active. Your entire cooling system only needs to keep the GPU cool.
I'm consistently impressed with how relatively cool my M2 Air stays when I'm playing No Man's Sky. I was expecting the game to be throttled to death, but I never see any real performance drops, while still being able to play it on my lap.