Every time I see someone say, “oh, sure, ARM is fast enough for a phone, but not for a desktop”, I’m always a bit astonished. Apple has built the absolute fastest, highest performance phone chips on the planet, designed specifically to run in the extremely limited mobile environment - hiding behind the screen in a 1/4” thick machine with no airflow, no active cooling, and quite limited battery capacity. And they’ve invested huge amounts of time and money in developing a world class processor design team. Do you really think they’ll just take whatever their current phone chip is and drop it in a laptop or desktop system?
I fully expect that, several years ago, they told the chip design team, “these new A-series chips are fantastic - now, we’ve got a side project for you - we want you to design us two new chips: one for a system with more room, active cooling, and 5x the battery capacity available, and the other for a system with much more cooling capacity and unlimited 3.3V/5V DC available and no batteries (both with tons more RAM). Now, just how much CPU can you build for us in those two scenarios?” And I expect we’ll see the first answers to those challenges in the fall.
You’re making the mistake of comparing specific chips optimized to run in phones with chips optimized to run in desktop systems, and assuming that’s a fair comparison and representative of what Apple will ship. You haven’t yet seen what an ARM chip designed for laptop/desktop use is capable of. The Intel/AMD x86_64 instruction set doesn’t have any inherent advantages over the ARM instruction set. But ARM chips tend to have much higher performance per watt (this is why you don’t see phones running x86 chips, no matter how much Intel would like that). The latest iPhone/iPad chips beat a lot of laptop systems on performance already, and the chips they’ve designed for laptop/desktop use are going to be even faster.

Leaker Suggests New Apple Products Are 'Ready to Ship' Amid Rumors of Intel-Based iMac Refresh
BeatsX are $100 now but they’ve been out for coming up on 4 years unchanged. I believe $180 was the original release price for the first couple years. I don’t know if $200 is going to be the price of the Airpods X, but whether that prediction is off by a bit seems like a strange reason to write...
A good post by CarlJ from another thread.
Azrael.
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Intel confirms Alder Lake is using Hybrid Core/Atom architecture - VideoCardz.com
Intel has issued a Linux patch adding Alder Lake Intel processor family support. Intel confirms Alder Lake is a Hybrid Atom/Core architecture This is a confirmation that Intel Alder Lake series will feature Big and Small core architecture, where the latter is derivative of Atom, a comment from...

Azrael.