CNBC Daily Open: It's a boom, it's a bubble, it's still not enough for investors: It's AI

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Taken from CNBC’s Daily Open, our international markets newsletter — Subscribe today Investors can't get enough of artificial intelligence, despite worries over the sector's excessively high valuations. The S&P 500 , Dow Jones Industrial Average and Nasdaq Composite rose Tuesday stateside, with all three notching new intraday highs. The major averages were juiced by gains in tech. Nvidia popped nearly 5%, while Microsoft climbed roughly 2%. Both Apple and Microsoft reached a market

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