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I watched Nvidia's Computex 2024 keynote and it made my blood run cold
(www.techradar.com)
This is a most excellent place for technology news and articles.
The lack of last-last gen hardware on the used market suggests this isn't true. Even if it were available, the buyers will run it and the overall energy consumption will still increase. It's not like old hardware disappears after it's replaced with newer models.