Shares of Advanced Micro Devices ( AMD) were among technology's losers Friday, sinking 11% after the chipmaker warned that fourth-quarter operating income would be "substantially" below third-quarter results. It also projected revenue below Wall Street's forecast.

AMD said its results were hampered by significantly lower microprocessor average selling prices, which offset increases in unit sales. The company estimates that revenue increased by about 3% on a sequential basis, which would yield a top line of about $1.37 billion. Analysts polled by Thomson First Call project fourth-quarter earnings of 22 cents a share and revenue of $1.85 billion. Shares were trading down $2.26 to $17.92 on extremely heavy volume.

PDF Solutions ( PDFS) slid 11% after the software company cut its fourth-quarter earnings projection. The company expects to report adjusted earnings of 5 cents to 7 cents a share, down from an earlier forecast of 13 cents to 15 cents a share. PDF estimates revenue of $18.7 million to $19.1 million, below an earlier projection of $21 million to $22.5 million. Analysts had forecast earnings of 14 cents a share and revenue of $21.8 million.

"We are disappointed to announce preliminary financial fourth quarter results that are below our prior guidance," the company said. "For the first time ever, a letter of agreement for an integrated yield ramp engagement, received from a new customer during the third quarter of 2006, did not culminate in a full definitive agreement." Shares were down $1.44 to $11.41.

Shares of CalAmp ( CAMP) tumbled 9% after the wireless-equipment provider posted disappointing third-quarter results. For the quarter ended Nov. 30, the company earned $896,000, or 4 cents a share, on revenue of $61.1 million. Analysts expected earnings of 6 cents a share on revenue of $61.1 million. A year earlier, CalAmp earned $5.4 million, or 23 cents a share, on revenue of $64.5 million.

CalAmp projected fourth-quarter earnings of 3 cents to 7 cents a share, with revenue of $54 million to $60 million. Analysts project earnings of 6 cents a share and revenue of $60.4 million. Shares were trading at $7.33, down 74 cents.

Napster ( NAPS) rose 6% after the company said that it would become the exclusive music subscription provider for Time Warner's ( TWX) America Online. Napster will replace AOL's current offering, AOL Music Now. AOL will also promote the Napster brand within its free music site. The service change is expected to be complete within the next 60 days. Shares of Napster were adding 22 cents to $4.04.

Shares of AsiaInfo ( ASIA) climbed 10% after the telecom software provider said it recently signed a contract with China Unicom ( CHU) to develop a mobile email system. Financial details weren't disclosed. Shares of AsiaInfo were up 82 cents to $8.57.

Other technology movers included Sirius Satellite Radio ( SIRI), up 16 cents to $4.06; Level 3 Communications ( LVLT), up 26 cents to $6.74; Microsoft ( MSFT), up 16 cents to $30.86; Intel ( INTC), down 23 cents to $21.69; Sun Microsystems ( SUNW), down 9 cents to $6.05; Apple ( AAPL), down $2.02 to $93.78; and Cisco Systems ( CSCO), down 11 cents to $28.58.