This comment made me realize I've never seen power per core specified. That seems like a great metric. Would calculating this be as simple as dividing peak usage by the number of cores? (Ignoring that modern CPUs have multiple core types)
But as the other commenter said, the actual per core usage will vary /wildly/ even under high load. You would half to run something fairly specialized such as prime95, which can run entirely from cache, to get more accurate per core wattage values under same load maximum load.
As it stands, my i9-13900K seems to have an idle “package” draw of around 10-12w and can peak at 360w under prime95 load. And that’s stock. I can make it ramp way past 360W with very little effort.
But under “normal” desktop usage it happily sits well under 100w.
So… shrugs. I would like to know more on this parent’s setup instead of “My server with literally 40% of the core count uses 1/6 of the power!”
But we may not be so lucky.
My commentary is only really about what we believed about AMD before making our purchase (internet forums like this one warn about energy use), how that wasn't really the case when we measured it on a real load, and why we 'feel' we would prefer to go the smaller and cheaper AMD server route next time.