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nigerweiss comments on Who thinks quantum computing will be necessary for AI? - Less Wrong
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Building a whole brain emulation right now is completely impractical. In ten or twenty years, though... well, let's just say there are a lot of billionaires who want to live forever, and a lot of scientists who want to be able to play with large-scale models of the brain.
I'd also expect de novo AI to be capable of running quite a bit more efficiently than a brain emulation for a given amount of optimization power.. There's no way simulating cell chemistry is a particularly efficient way to spend computational resources to solve problems.
An optimal de novo AI, sure. Keep in mind that human beings have to design this thing, and so the first version will be very far from optimal. I think it's a plausible guess to say that it will need on the order of the same hardware requirements as an efficient whole brain emulator.
And this assumption shows why all the promises made by past AI researchers have so far failed : we are still a factor of 10,000 or so away from having the hardware requirements, even using supercomputers.