Hacker News Reader

https://www.anandtech.com (Ian Cutress et al.) has good regular "deep dive" pieces. David Kanter at https://www.realworldtech.com is worth a read, although his site is not as active.

Check out the WikiChip tops level page. Covers both Intel, AMD, and ARM. Nothing particular to Apple though. https://en.wikichip.org/wiki/WikiChip

Also a great book though maybe dated by now is Modern Processor Design by Shen.

The site has a search function, did ya find anything?

I remember Stokes had a recommended book and quite a few articles on Ars Technica back in the day. Covering older hardware, but typically a prereq in understanding newer compatible designs.