Nvidia (NVDA) will report its highly anticipated fourth quarter earnings after the bell on Wednesday. Analysts and investors will be focused on how much revenue the company generated via its powerful Blackwell line of chips — as well as insights into how the AI giant is navigating the looming threat of tariffs and the potential for further export controls on shipments of its processors to China. Nvidia is the reigning champion of AI chips, and it’s not losing that crown anytime soon. Its chips are the envy of Silicon Valley and beyond, and its competitors are still far from overtaking…