Nvidia faces growth test as Rubin debut meets AI financing scrutiny

Aug 25 : Nvidia's results on Wednesday will test whether the company's latest Rubin chips can drive another period of explosive growth, with some investors questioning the sustainability of the AI spending boom.The chipmaker has been the biggest beneficiary of the race to build AI infrastructure. Recently, though, its stock has come under pressure as the company has pumped billions of dollars back into the AI ecosystem, stoking fears about its role in so-called circular deals that could artificially inflate demand and distort broader economic signals.Nvidia's shares have risen 11.8 per cent so far this year and lagged major rivals, with the company briefly ceding its position as the world's most valuable firm to Apple last month. On average, analysts expect its second-quarter revenue to ne