MatX, a startup designing chips that support large language models, has raised a Series A of approximately $80 million, three sources say, less than a year after raising its $25 million seed round. Spark Capital led the investment, valuing the company at a pre-money valuation in the mid-$200 million range and a post-money valuation of the low $300 million range, a person who reviewed the deal told TechCrunch. MatX was co-founded two years ago by Mike Gunter, who previously worked at Google on th...