$NVIDIA(NVDA)$ Despite the fanfare, the artificial intelligence (AI) revolution has just begun. With the AI market valued at $189 billion in 2023, the United Nations believes it will become a $4.8 trillion market by 2033.Companies like Nvidia have already taken advantage of this growth, soaring to multitrillion-dollar market caps. But the two AI businesses below trade at just fractions of that value. Over time, however, we could see one of these stocks surpass Nvidia's market cap, leading to huge gains for patient shareholders.This is what makes Nvidia so specialRight now, most estimates believe that Nvidia commands somewhere between 70% and 95% of the AI graphics processing unit (GPU) market. GPUs, or graphics processing units, are critical