And this stock is Super Micro Computer ( SMCI 0.07%), a company that saw its stock price soar 188% in the first half, surpassing Nvidia's 149% increase. Though individual forecasts vary, the average Wall Street estimate calls for the stock to climb 90% from today's level.

A rally from the “magnificent seven” tech stocks perhaps predictably fueled the rally, but this surprise name was the S&P 500’s biggest gainer Thursday.

Nvidia’s stock historically has made dramatic moves in the year after initial Fed interest-rate cuts, and it has outperformed the S&P 500 on average when looking at all rate cuts since the IPO.