NEW YORK Tech giants like Nvidia, OpenAI, AMD and Oracle have stepped up multi-billion-dollar investments for artificial intelligence (AI) partnerships to strengthen their infrastructure and transform the global tech ecosystem amid rapidly rising demand for AI integration. Global AI spending is expected to reach $375 billion this year and $500 billion in 2026, according to investment bank UBS. The latest of these partnerships is between ChatGPT-maker OpenAI and chipmakers Nvidia and AMD. AMD