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Intel Core Ultra 200V promises Arm-beating battery life without compatibility issues
(arstechnica.com)
This is a most excellent place for technology news and articles.
I couldn't find any clarification in the article but in guessing these are still x86_64 and from the description it seems like they've stacked a lot of different components into a single CPU core. Normally both those things would make it a big powerhouse so I'm not sure how it's going to beat arm on baterry which competes by having a smaller simpler ISA that doesn't need as much resources or complexity to process.
People overblow the importance of ISA.
Honestly a lot of the differences are business decisions. There is a balance between price, raw performance and power efficiency. Apple tend to focus exclusively on the latter two at the expense of price, while Intel (and AMD) have a bad habit of chasing cheap raw performance.
Decode overhead is fairly fixed, and proportionately has become tiny over the decades. Most larger instructions dispatch to microcode, and compilers know better than to use them much.
There's a price to x86, but for larger cores it's pretty small, we've learned to work around it.
Apple bothered to do the things Intel was too lazy to do for so long, particularly improve the ooo and other resources to where Intel didn't want to spend the silicon. Intel has always been cheap, nickel and diming their way out of performance, this is the cost.