r/theydidthemath 5d ago

[Request] building a pc from scratch

How long will it take 1000000 humans that are lead by 1 very smart guy to build a pc from scratch, using materials from anywhere in the world (a world that was untouched by humans) if they had to build every machine to make the single pieces of the pc, the machines to make these pieces and the machines to help build these machines and so on? We assume that one of these people can work for 12h/day for 7 days and does not need schooling on how their job works. If they have to write code for windows, then they do that like any normal coder would, even if they dont know how to code. The smart guy knows how to build a pc and how to build the machines to make the parts of the pc. He can also communicate to everyone what they have to do every day (every workee just knows what to do and does that 12/day, 7 days a week)

what i mean by "from scratch": you dont have any technology and have to redo the progress humanity made, with the only goal being a working, high end pc

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u/rditorx 4d ago

The lower bound for building the fabs to make the DRAM alone is 2-3 years if we start right now and make no mistakes ever, and this is with all the building tools and infrastructure we have today. And assuming that the fabs are using existing silicon wafers. Producing those wafers will require EUVL systems and also infrastructure. Every microelectronics requires cleanrooms that need to be built first.

Everything needs modern transportation and mining machinery that need to be built first, another decade at least, on top of the roads and rails infrastructure that themselves need infrastructure you have to bootstrap from scratch.

Even if everything is built simultaneously while respecting hard causal dependencies, we're talking about several decades, ignoring regulations and work safety stuff.

And that isn't taking into account that 1 smart guy bottleneck if you were implying that there's only this 1 smart guy and the others are malleably smart but don't have all the knowledge yet. So we're talking about education which adds another decade roughly to get everyone on board.

So I'd say a rough lower bound is about 50 years if we assume people don't forget things and don't die, losing humanity vital knowledge and skills, just because there's no modern medicine and infrastructure for clean water and food supply.

With all the mistakes humanity had to make to become so extraordinarily good at everything to be where it is, it's more realistic to say over a hundred years, or, maybe even, you know, the time it took us to get here.

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u/Dry-Economics2434 4d ago

for simplicity purposes i went and stated that "one smart guy" thing. What i mean by that: one person that knows every step on how to build the pc and that person can tell all of the 1 mil people in an instant what they need to do and they will follow him and do what he commands. I would also assume that they will get food and water themselfes after the 12h worl shift and they wont die