Nvidia (NVDA 0.53%) isn't just leading the artificial intelligence (AI) infrastructure boom: It is the boom. Its graphics processing units (GPUs) have become the backbone of AI data centers, while its CUDA software has helped create a huge moat around its business.Over the past two years, data center revenue has exploded by more than 9x, going from $4.3 billion to$39.1 billion. For a company of Nvidia's size, that kind of growth is almost unheard of. That momentum has pushed Nvidia past the $4 trillion mar ...