Nvidia shares rose nearly 9% Thursday after the chip giant's revenue guidance reassured investors that artificial intelligence demand will remain strong.The surge added about $440 billion to the chip giant's market cap.Investor bullishness suggests Nvidia could buck the trend of its stock dropping the day after reporting earnings in all of the previous four quarters, despite meeting or beating estimates.Several chip stocks also rallied following Nvidia's release, with Broadcom and Intel rising. ...