In early October, OpenAI president Greg Brockman and AMD CEO Lisa Su made the rounds of TV news shows, smiling ear to ear as they announced a multiyear partnership worth tens of billions of dollars—one that will see OpenAI deploy hundreds of thousands of AMD chips across its Stargate Project data center mega-campuses. The deal represents roughly six gigawatts of computing power, or about three times the amount of electricity the Hoover Dam can generate. Su told Fortune that Brockman’s insistence...