Investors have found another major way to play the artificial-intelligence trend besides semiconductor stocks, and that’s led to a changing of the guard atop this year’s list of the best S&P 500 performers.

Nvidia stock has soared more than 700% in less than two years, and there are a lot of factors that will continue influencing its share price.

Nvidia stock has dropped over the past few months. Investors should hang on—tight. Shares have fallen to $116, a 14% decline from their record close around $135, hit in June. They were down 38% to $98 at their lowest levels during this summertime drop.

Semiconductor and homebuilder stocks are forming a bubble.