By Arsheeya Bajwa and Stephen Nellis (Reuters) -Nvidia forecast quarterly revenue well above Wall Street estimates on Wednesday and CEO Jensen Huang touted blockbuster demand for its AI chips from giant cloud providers. Shares of the AI market bellwether jumped 5% in extended trading, setting up the company to add $220 billion in market value. The results calmed – at least temporarily – investor nerves frayed over concerns that an AI boom has outrun fundamentals. Global markets have looked to the chip designer to determine whether investing billions of dollars in AI infrastructure expansion has resulted in an AI bubble. Ahead of the results, doubts had pushed Nvidia's shares down nearly 8% in November, after a surge of 1,200% in the past three years. The broader market has declined almost

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