NEW YORK - Nvidia's board is preparing to oust its co-founder and CEO Jensen Huang, US media reported Wednesday, as the chip giant's chief faces new accusations of infidelity, after revelations he had an affair with a woman accused of spying for China. Nvidia’s share price slid more than 8% in after-hours trading on Wednesday, extending a multi-day sell-off for one of the world’s most valuable publicly traded companies.