Etched was founded in 2022 by Gavin Uberti, Robert Wachen and Chris Zhu, and emerged from stealth in June of this year. AI hardware start-up Etched has raised $700m in a new funding round led by US trading firm Jane Street, which the start-up said boosted its valuation to $21bn – doubling its valuation in less than a month. Etched builds inference clusters to make AI inference – essentially the process of using a trained AI model to make predictions on new data – faster, cheaper and more efficient. To do this, the start-up said it co-designs chips, racks, software and manufacturing…