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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.
The Risc Isa isn't simple anymore. It has more instructions than a 90's CISC CPU.
Arm has 64 bit, 32bit and 16 bit (Thumb) instructions.
The legacy 8-32bit Intel ISA doesn't eat power if it isn't used. It wastes a little silicon but it's extremely tiny on modern CPU's.