Tech giant Nvidia is now worth over $3.2 trillion, with its dominance as a chipmaker making it the poster child of the artificial intelligence boom. After the stock's swift rise on Wall Street it briefly topped Microsoft as the most valuable company in the S&P 500 this week. And it's an unlikely piece of technology — graphics chips initially invented to create more realistic video games — that has propelled the company to AI fame.

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Experience high-tech up close. Silicon Valley has the highest concentration of high-tech workers of any metropolitan area and is the biggest h…