Nvidia, one of the top-performing stocks of 2024, has seen impressive market returns due to the growing demand for AI technology in various industries. However, concerns about the company's valuation and a potential AI bubble have emerged. On top of that, Nvidia's largest customer, Super Micro Computer Inc., is facing possible delisting and a DOJ investigation, which could impact the chipmaker's future earnings. With NVIDIA's Q4 2024 earnings report set to be released on November 20, the stock could face further challenges in maintaining its impressive performance.