You do realise that you are comparing Milan (Zen 3) against Icelake (Sunny Cove) and not Alderlake (Golden Cove) right? And what exactly did you link there? It is not an efficiency chart involving power in any way. All I see is that the EPYC7763 has a lower per thread performance that the Xeon 8380. And the cpus higher in the chart are much lower core-count cpus running at much higher all-core clocks. In any case all these,
alone, are not relevant to power/energy efficiency. You need a chart to show power consumption and time to complete a task for that. Also, if you really want to compare apples to apples in terms of efficiency you have to compare cpus of equal core count. Because a higher core count cpu can achieve the same or even higher throughput by running at significantly lower frequencies and thus have significantly lower per core power consumption. Even with the same architecture an 8-core cpu running all cores at 4.8GHz will consume way more power than a 16-core cpu running all cores at 2.4GHz (even if they both complete the task at the same time). That’s because power consumption increases fairly linearly with core count whereas (after a certain frequency) it increases non-linearly (exponentially) with frequency. And, by the way,
in idle power comparisons Intel wins comfortably for several generations now (both in equal and non-equal core count comparisons). Especially now with Alderlake and the use of e-cores it is not even close.