The power efficiency difference between x86 and ARM boils down to legacy baggage in the instruction set. ARM doesn’t suffer from that baggage, and that’s why Apple was able to make their chips so efficient.
GPUs are a different story though, and I don’t even know how you would compare the here. Maybe the voltage difference could explain some of that power efficiency gap.
The power efficiency difference between x86 and ARM boils down to legacy baggage in the instruction set. ARM doesn’t suffer from that baggage, and that’s why Apple was able to make their chips so efficient.
GPUs are a different story though, and I don’t even know how you would compare the here. Maybe the voltage difference could explain some of that power efficiency gap.