Nvidia's private investment portfolio surged to $42.3 billion as the company deployed $17.9 billion in one quarter, revealing a growing AI investment empire.

Nvidia's soaring revenue highlights the escalating demand for AI infrastructure, raising questions about sustainability and geopolitical risks.

Chip giant Nvidia on Wednesday posted record quarterly revenue of $81.6 billion, blowing past Wall Street forecasts as insatiable demand for its artificial intelligence hardware…