Not all geekbench scores are created equal. Comparing ARM and x86 scores is an exercise in futility as there are simply too many factors to work through. It also doesn't include all workload types.
For example, I can say with 100% confidence that M1 has nowhere near 32MB of onboard cache. Once it starts hitting cache limits, it's performance will drop off a cliff as fast cores that can't be fed are just slow cores. It's also worth noting that around 30% of the AMD power budget is just Infinity Fabric (hypertransport 4.0). When things get wide and you have to manage that much wider complexity, the resulting control circuitry has a big effect on power consumption too.
All that said, I do wonder how much of a part the ISA plays here.
For example, I can say with 100% confidence that M1 has nowhere near 32MB of onboard cache. Once it starts hitting cache limits, it's performance will drop off a cliff as fast cores that can't be fed are just slow cores. It's also worth noting that around 30% of the AMD power budget is just Infinity Fabric (hypertransport 4.0). When things get wide and you have to manage that much wider complexity, the resulting control circuitry has a big effect on power consumption too.
All that said, I do wonder how much of a part the ISA plays here.