The Elon Musk-backed artificial intelligence start-up xAI is raising more financing than initially planned – including an equity investment from Nvidia – to bring its ongoing funding round to US$20 billion, according to people with knowledge of the matter.The financing, which includes equity and debt, would be tied to the Nvidia graphics processing units (GPUs) that xAI planned to use in Colossus 2, said the people, who asked not to be identified because the information was private. That is the...