And wiring is typically rated for current limits not voltage (within reason). Some 12 gauge wire doesn't care if you're pushing 12V, 120V, or 240V but is only rated for 20A.

I wouldn’t use that kind of power continuously. AFAIK the sockets are supposed to handle 16A for at least six hours, when they are new. When charging your car on Schuko sockets it’s good practice to limit it to 10A and check for the socket temperature after a while. Also, any connections in the cabling can have increased resistance with age and heat up with heavy continuous use. That shouldn’t matter that much when running a kettle or toaster for a few minutes, but charging a car or gaming for hours can become a problem.

Are there many consumer PSU's with two ATX24 connectors? A quick search only shows Phanteks making one.

That's almost 1W per dollar!

The easiest way to think about it is that the conductor is rated for the current, and the insulator is rated for the voltage. Now, once you get into the nitty gritty, they're more intertwined than that, but it's close enough for a surface level explanation.

Nvidia controls enough of the market that more PSU manufacturers would if Nvidia needed it.

Actually, in the US the outlets are often wired with 1 leg, while giving 2 legs gets you back to 240v.

110 is probably better in terms of general safety (which is good because our houses are death traps), but it means when you do need power you need a special circuit.

We should have both more common, but the plugs are terrible (basically they turn the left prong 90 deg).

3840W per breaker. Minus 2400 leaves 1440W, for a CPU, the minor components, and monitors/other equipment. In theory it could work.

I'm gonna oneup those kettles with >7500W showerheads

You would still need to run the computer off multiple plugs, as almost any 240v plug is 10a.

You'd likely need a dedicated breaker and plug, similar to a stove plug.

110 is probably better in terms of general safety

Eh, not really. There is no significant difference in safety between 110vac and 230vac. Voltage is not the (most) dangerous part, it's the amps that kill if you're electrocuted.

Standard US outlets can't deliver 3000 watts.

when you do need power you need a special circuit.

We also have a standard socket and a high power socket.

Expect our normal outlets provide 230V 16A 3.5kW (3kW sustained) and the typical high power outlets outlets provide 400V 30A 11kW or 400V 60A 21kW.

Which is why typical electric stoves here use 11kW and typical instant water heaters use 21kW.

Though probably the most noticeable advantage is in electric car charging.

That's why I started my sentence with "In Europe"

Amps are voltage over resistance (I = V/R), volts absolutely matter, the human body has a decent resistance and the higher voltage helps burn through that.

Yeah, in Sweden I charge our plug in hybrid off 240, it's pretty quick and you can use any outlet.

The giant round connectors are weird BTW, with all the holes, trying to sort that out for faster charging.

I don't think we should run 100+ volts everywhere, we need to standardize on lvdc in most places (basically usb-c or so) with 100v only in kitchens and places you need it, because it's more dangerous and can cause fires more easily.

But I live in America so naturally you're referring to US outlets, right??

That's a common misconception. It's the Amps that cause fires, not the voltage.

The 5090 uses 600W, at 12V that's 50A, but at 120V that'd only be 5A and at 240V only 2.5A.

50A melts cables and burns your PC down, 2.5A won't. The only risk of higher voltages is that they can jump across small air gaps much easier.

There's a reason we talk about lethal current and not lethal voltage...30mA can kill you, even at something ridiculously low as 9V, but 5-10kV will not necessarily kill you, e.g. fences for horses will not kill you if you're electrocuted by them because there's basically no amperage. Voltage is not the determining factor in lethalness.

Here, plugs are 230V and 16A = 3680W. Not quite as much as I thought (most extension cords seem to be rated for a bit more, which makes sense), but definitely enough to run monitors of the same breaker.