Nvidia and CEO Jensen Huang are early winners in Big Tech's earnings week.Slaven Vlasic/Getty Images for The New York Times; Chelsea Jia Feng/BIBig Tech companies are reporting earnings this week, and there's already one early winner: Nvidia.Microsoft said it was spending big on buying tech to power its AI — tech made by Nvidia.Nvidia shares were up more than 12% by midafternoon trade on Wednesday.A slew of Big Tech companies are reporting earnings this week, and already at least one clear winner has emerged: Nvidia.The chipmaker continues to reap the benefits of Big Tech's large spending on artificial intelligence.