Shares of Intel Corp (NASDAQ:INTC, XETRA:INL), Advanced Micro Devices Inc (NASDAQ:AMD, XETRA:AMD) and Qualcomm Inc (NASDAQ:QCOM, XETRA:QCI) fell sharply on Monday after Nvidia Corp (NASDAQ:NVDA, XETRA:NVD) unveiled a new personal computer chip at the Computex trade show in Taipei, marking a direct challenge to the incumbents of the Windows PC processor market. Intel shares fell about 3% while AMD declined a similar amount.