The latest quarter delivered explosive cash generation and strong guidance, with real China risk and a rich valuation to weigh.Crowd-pleasing growth isn't new for Nvidia (NVDA -2.78%). But the AI and graphics chip company's late-August update still managed to turn heads. Revenue rose sharply year over year, and the data center engine kept humming. Management also issued bullish guidance for the current quarter.Sure, shares are down since the report. But remember: The growth stock is still up 28% year to dat ...