3 ms·
Many researchers and hobbyists cannot even plug in a 10 KW 8 GPU DGX server.
by wmf 11mo ago
Many researchers and hobbyists cannot even plug in a 10 KW 8 GPU DGX server.
- CamperBob2 11mo agoThat doesn't exactly bode well for the EV revolution, then, does it?
- tekno45 11mo agowut?
- deleted 11mo ago[deleted]
- LogicFailsMe 11mo agoThe average commute in the United States is about 24 miles a day round trip. That's about 10 kWH. That's enough to charge overnight on a 15A circuit.
- CamperBob2 11mo agoYou can drive around with 24 miles of charge, but ... I'll pass, thanks. In reality, if you have a dryer outlet, you have a good fraction of 10 kW available.
- LogicFailsMe 11mo agoI just put in a dedicated 50 amp circuit myself and my car charges from ~25% to full in about 6-7 hours. But I wanted to present the lazy worst case scenario. The warrior's FUD here is that there isn't enough easily available lithium for everyone in just California alone to have one.
- BuffaloEric33 11mo agoAlmost all home EV charging is <=10kW.
- quickthrowman 11mo agoWhy not? It’s 40A at 240V, or 25% of the continuous load rating of a 200A 240V single-phase service. If someone can afford an 8 GPU server, they should be able to afford some #6 wire, a 50A 2P breaker, and a 50A receptacle. It has the same exact power requirements as an L2 EV charger.
- knollimar 11mo agoYou probably run a bigger (perhaps double) neutral and care about a stronger ground. But yeah, the $12 is rounding error at this scale
- quickthrowman 11mo agoIn the US, you don’t need a neutral for a 240V 50A circuit on a residential single-phase service, there are two line conductors (120V to ground) both connected to a 2-pole single-phase breaker, line-to-line between the two is 240V. You would need a neutral if it was a 208/120V three-phase service. Neutrals and grounds are sized per the NEC, neutrals are the same size as the line conductors and equipment grounds are sized off of a table. #6 conductors and #10 ground is what the NEC calls for.
- knollimar 11mo agoI just haven't seen server rooms that don't demand a doubly sized neutral when one is required. I live the NYC 208V life doing mostly resi, though. Quick search of the spec for that is 6 power supplies, 2 of which are redundant. Looks to use a neutral to me. Says it uses C19/C20 connectors edit: wait most ranges use 14-50R outlets and need a neutral ran. I am calling your statement into question. Surely harmonics and 120V internal draws cause non-zero neutral current. And I'm sure GPUs have harmonics being semiconductor flavored.
- quickthrowman 11mo agoTurns out you are correct on both points! My bad, NEMA 14-50R is a 4-wire receptacle with a neutral. I learned something new today, 200% neutrals are not required by the NEC but can help with non-linear loads, and certain transformers that mitigate harmonics need 200% neutrals.