Much, if not most, of the credit for the current artificial intelligence (AI) boom belongs to Nvidia (NASDAQ: NVDA). Since the stock hit a cyclical low a little bit more than four years ago, it has risen by more than 1,700%, driven higher by the tech sector's insatiable demand for its graphics processing units -- the accelerators that power most AI data centers. Despite that remarkable stock price increase, Nvidia trades now at a price-to-earnings (P/E) ratio of 27. That's just above the current S&P 500 average of 26. Given that it is still delivering annual revenue growth that is often in the triple-digit percentages, that factor in itself may persuade investors to buy the stock. Nonetheless, investors may want to take a more cautious approach. Here's why.
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