if you define efficiency as compute per watt. I don't give a flying crap about watts. Efficiency is measured as amount of work done per hour. Because I get paid for the work, and then I pay the two dollars a week for the watts. I don't care if it's five dollars a week for the watts or two. I do care if it's two hours of waiting time versus five.

Compute per watt is compute per dollar. If you want more compute, spawn more cores. In this case, it will be cheaper with ARM.

lol no. the $20/month cost of electricity is a rounding error for my $6k laptop and the $50k of software licenses for it. It's even less of a rounding error for the datacenter, where a $500k ESX farm that has several million in software on it farm uses $5k of electric per per month including cooling.

Have you noticed almost no one uses ARM? There's a reason for that. Including software being licensed per core, so faster hotter cores and fewer of them win.