By Noel Randewich SAN FRANCISCO (Reuters) – Nvidia Corp posted higher fiscal second-quarter earnings on Thursday and gave a forecast for current-quarter revenues that exceeded Wall Street’s estimates, sending shares of the graphics chipmaker higher in after-hours trade. Nvidia relies on selling graphics chips for PCs for most of its business but it is also making inroads into cars and data centers, seen as potentially faster-growing markets for its chips. After struggling to compete against larger chipmakers like Qualcomm in smartphones and tablets, Nvidia has increased its focus on using its Tegra chips to power entertainment and navigation systems in cars made by companies including Volkswagen’s Audi, BMW and Tesla. Nvidia in July launched its own tablet aimed at game enthusiasts, called Shield, with Tegra chips and other high-end components, bucking an industry trend toward commoditized, inexpensive devices.