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"tinybox red is 6x 7900XTX, tinybox green is 6x 4090"

So the red is ~$5k in gpu's - where is the other $10k going?

Motherboard and CPU, memory, NVMe drives, PSUs, SlimSAS cables and breakouts, a custom machined case, assembly, support.

You're free to try building one yourself for cheaper. If you consider your time for researching/assembling/testing it to be worthless, and are happy with a contraption in a miner frame, then you can probably do it.

PC builds seem to short circuit everyone's pricing logic and drive any labor cost down to $0, just because they're willing to do it for free. Anything above that $0 is considered overpriced.

It’s not that they’re willing to do it for free. It’s that they’re doing it for fun. It’s a hobby, not work.

Part of the fun is planning, researching, putting together the pieces and power it on.

There are services that will build a PC for $200. It's entirely valid to ask where the money goes, and the answer is not the labor to put the pieces together. There's no reason to assume OP is being dismissive of that specific cost.

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