Shares of Dell cratered after the company's first-quarter earnings report.When it comes to artificial intelligence (AI), the megacap tech firms collectively referred to as the "Magnificent Seven" tend to receive the most attention.In my opinion, the Magnificent Seven represents big-picture ideas featuring AI. For example, members such as Nvidia, Tesla, and Microsoft can help investors assess how AI is being deployed across data centers, autonomous driving, and cloud computing.Smart investors understand that ...