this post was submitted on 23 Nov 2024
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140Wh seems off.
It's possible to run an LLM on a moderately-powered gaming PC (even a Steam Deck).
Those consume power in the range of a few hundred watts and they can generate replies in a seconds, or maybe a minute or so. Power use throttles down when not actually working.
That means a home pc could generate dozens of email-sized texts an hour using a few hundred watt-hours.
I think that the article is missing some factor, such as how many parallel users the racks they're discussing can support.
Datacenter LLM tranches are 7-8 H100s per user at full load which is around 4 kW per second.
Multiply that by generation time and you get your energy used. Say it takes 62 seconds to write an essay (a highly conservative figure).
That's 68.8 Wh, so you're right.
Source: I'm an AI enthusiast
Well that's of the same order of magnitude as the quoted figure. I was suggesting that it sounded vastly larger than it should be.
They're probably factoring in cooling costs and a bunch of other overhead, I dunno