Nvidia is no longer the only game in town when it comes to artificial intelligence (AI) hardware. I'm being facetious when I tell you to forget Nvidia (NVDA -0.36%). After all, how can you ignore a stock that soared nearly tenfold in just 18 months and now has a $3.1 trillion market cap, which accounts for 6.7% of the entire S&P 500 index? Not to mention, the company's chips are the driving force behind artificial intelligence (AI). However, the incredible run in Nvidia stock made it quite expensive, even r ...