Justin Sullivan / Getty Images With Monday's gains, Nvidia shares have added more than a third of their value since the start of the year. Key Takeaways Nvidia shares climbed Monday after the chipmaker said it plans to invest up to $100 billion in ChatGPT maker OpenAI to build out AI data centers. Shares of several Nvidia partners and companies that make equipment to manufacture chips also rose. Nvidia and OpenAI said they expect to finalize the details of the partnership in the coming weeks. Nvid ...