LOL comments that x86 can be magically more efficient. Yeah sure, they just decided for the last 20 years they didn't want to make their cpu's efficient.
ARM is inherently more efficient because it's a RISC architecture vs x86 being CISC. When it comes to handling memory, ARM processors operate with register-based processing, limiting direct memory access to also improve energy efficiency, while x86 architectures allow more direct interaction with memory, allowing complex computational tasks at the expense of higher power consumption.
Of course, finally we are seeing attempts by Intel to make x86 more efficient, but at this stage it's all hype and we have to wait for Lunar Lake to see if they can actually deliver on that hype. Meteor lake was also hyped to be more efficient and that is total BS. Currently, in performance per watt ARM is light-years ahead.