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And only 64 cores, versus 256 for the IBM chip. The "mind-blowing" part is about its efficiency, not about its total memory or core count.

Is there some optimal memory amount per core where going above or below is less efficent?

No clue, this is about energy efficiency though. Perhaps I should have said that, but it was in the article so I figured people would understand.

It's also pretty clear this is a prototype, not a final product that can never be improved in any possible way.

The article is saying that the efficiency comes from the use of on-die memory, avoiding the von-neuman bottleneck

The 7995WX has 480mb, >100% more.

And with Sapphire Rapids having 64GB of HBM2e, I think even TR's is quite miniscule.

And going the other way, the consumer 7900x3d has 57% as much L3 cache (128MB)...