Shares in graphic chip supplier Nvidia Corp. fell Tuesday after Deutsche Bank downgraded the stock on seasonal weakness and limits to potential market-share gains. Analyst Arnab Chanda downgraded the stock to "Hold" from "Buy" and said in a note to investors he was taking a more cautious stance on Nvidia. He said demand had slowed after several quarters of market share gains against Advanced Micro Devices Inc. and its unit ATI Technologies Inc.

Chanda said that in light of expected economic weakness in the first half of 2008, he is focusing on companies that have strong product cycles, profit margin improvement and an attractive stock price. Canaccord Adams analyst Bobby Burleson began coverage on Nvidia with a "Sell" rating.

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