ARM vs. X86 is just the instruction set. The instruction set plays almost no role in power / performance these days. Maybe once in a very distant past when an x

ARM vs. X86 is just the instruction set. The instruction set plays almost no role in power / performance these days. Maybe once in a very distant past when an x86 decoder was a significant chunk of silicon, but not these days. So instead you'd need to ask how does Zen 2 compare to Cortex A76 or something like that. Which we don't know since we don't have the 15W Zen 2 mobile parts to benchmark yet.