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If a brain connected to a machine is "AGI" then we already have a billion AGIs at any given moment.

Well, I mean to say, not exactly human brains. Consider an extremely large brain modified to add/remove sections to increase its capabilities.

They already model neural networks on the human brain, even though they currently use orders of magnitude more energy.

But modifying a brain to be bigger and better doesn't require much in the way of computers, it's basically a separate topic.