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If I acquire some cheap H200s, I intend to build a rack mount power supply that I can feed from a dryer plug. 4x H200's need about 2.8KW, which you could pull from a standard 240VAC 20A dryer/oven breaker [0].

[0]: https://www.sunbirddcim.com/blog/nvidia-h200-power-requireme...

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2.8KWs is just the GPUs. Add another 400 watt for CPUs and RAM and the rest of the hardware, and then leave at least a 30% headroom for PSU loss and spikes. Suddenly you're close to 4KW. And then of course you'd have to remove all that heat from the room.

So... a 30A breaker instead of a 20A breaker? And a few hundred bucks creating a venting solution to the outside? I could set this up at my house right now, by myself, in a day, maybe 2.

Should be fine, just put in a 60A breaker, 6AWG line, etc. Just like you would for 48A EV charging.

The 20A breaker already had 30-40% headroom.

You're required to have at least 20% for continuous loads and your breaker may nuisance trip if you don't.

Yeah? My shop at home has two 4kw electric heaters in it. That's not even a big deal to wire up to your main panel.

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