What does it run on?

Not sure what they run on in 2026, but next year, 800V DC, 1MW per rack:

https://developer.nvidia.com/blog/nvidia-800-v-hvdc-architec...

The graphics cards still take 12V. They're just bringing a higher voltage to the server PSU. That's a forgettable, easily replaceable commodity component.

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...

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.

[delayed]

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.

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.

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