SINGAPORE/BEIJING (Reuters) — Nvidia (NVDA) has told customers in China it is delaying the launch of a new artificial intelligence chip it designed to comply with U.S. export rules until the first quarter of next year, two sources familiar with the matter said. The delayed chip is the H20, the most powerful of three China-focused chips Nvidia has developed to comply with fresh U.S. export restrictions, the sources said, and could complicate its efforts to preserve market share in China against local rivals like Huawei. The California-based AI chip giant had been expected to launch the new products as early...