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How does faster mean less energy? Thats only true if you’re running faster on the same hardware…

Presumably. Less time the giant chip has to draw power for computation. The point is that everyone's interested in making AI power efficient, while crypto's proof of work is a competition for more power burned hashing and throwing away the result.

I think they are talking about the case where, hypothetically, there is a 10x increase in speed but only 2x increase in power consumption

I’m just pointing out that this is not a given…

Bitcoin energy requirements will be cut in half in a few days..

It's still a monstrosity compared to a traditional parser. You can even be fancy and use complex parsers that backtrack and can deal with mildly context-sensitive languages (as required for HTML, XML, and many programmin languages), and you'd still be more efficient.