Nvidia believes data center capital expenditures could reach $3 trillion to $4 trillion by 2030.During Nvidia's (NVDA -0.77%) Q2 conference call, it made a jaw-dropping market projection: Management believes global data center capital expenditures will reach $3 trillion to $4 trillion by 2030. That's a ton of money being spent on AI infrastructure, and if it's right, investors should be racing into AI stocks to capitalize on this spending.However, I'm not referring to companies that are spending the money o ...