Nvidia 's $100 billion mega investment in OpenAI was hailed as a sign of artificial intelligence's momentum as the chipmaker's rally continued to boost the broader stock market to a record, but seasoned investors said the move looked more like a troubling echo of past bubbles. The chipmaker said it will invest up to $100 billion in OpenAI as the AI lab sets out to build hundreds of billions of dollars in data centers based around Nvidia's AI processors. Nvidia shares jumped nearly 4% on Monday following the announcement, lifting the S & P 500 to another all-time high. However, some warn that the partnership fits the definition of vendor financing — Nvidia giving OpenAI money so OpenAI can turn around and spend it on Nvidia chips — and investors shouldn't celebrate. "OpenAI is now selling i

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