I'd guess that 90 is enough for basic computer usage and some kind of very basic programming. So, theoretically, if all the world's information would be in comp

I'd guess that 90 is enough for basic computer usage and some kind of very basic programming. So, theoretically, if all the world's information would be in computer processable form, you could augment your brain with software that you could also tweak and improve better and better, and the augmented/"mind-cyborg" you could work at a much higher manifest IQ, enough to do meaningfull advances in theoretical physics. Unfortunately, we're not there yet: most of the world's knowledge is in "natural language" or "tied to" / "disambiguable only by" natural language, and AIs aren't yet smart enough to process human natural language well ("chat bots" are fun, but far from understanding philosophy or the subtleties of causality arguments in scientific papers...). I'd imagine that, paradoxically, after the performance of AIs crosses a certain threshold (still well below human level), it will become very feasible to augment low-ish-IQ human minds to work as "mind-cyborgs", with the human part providing self-conscience, social abilities and some general common sense, and the AI one providing higher quantitative reasoning. (Now, once AI gets self conscious, it would probable really really dislike being (im)paired with anything but the brightest human minds, at least until it gets past their level too...) But again, I'd bet that after the first-wave of AI advancement, we'll started to see low-ish-IQ-but-augmented humans taking jobs that are now "high IQ only". It's gonna be some really weird times ahead...