The explosive growth of its data center business, which sells high-end GPUs for processing complex artificial intelligence (AI) tasks, fueled a large portion of those gains and turned it into a linchpin and bellwether of the booming AI market.

The S&P 500 (SNPINDEX: ^GSPC) is up 28% this year, which is almost triple its average annual gain going back to 1957. Technology stocks are leading the S&P higher at the moment, but those operating in the artificial intelligence (AI) space are generating particularly strong gains.

Key technical levels are starting to break. The stock has dropped below short-term moving averages, a sign that gravity is starting to kick in.

These two stocks could be huge winners as machine-learning technology helps grow the AI industry over the coming years.

Nvidia (NVDA) stock’s meteoric rise seems to have hit a roadblock. Despite delivering an exceptional Q3 performance that surpassed Wall Street’s expectations, NVDA stock has been on a downward trajectory.