Updated from 1:07 p.m. EDT

Shares of

RF Micro Devices

(RFMD)

were among technology's losers Thursday, slumping 10.8% after the chipmaker backed its fourth-quarter guidance but warned that first-quarter results would be lower than Wall Street's forecast.

For the fourth quarter ended March 31, the company continues to see fourth-quarter adjusted earnings of 10 cents to 11 cents a share on revenue of $250 million to $260 million. Analysts polled by Thomson First Call project earnings of 11 cents a share on revenue of $255.6 million.

Looking ahead, RF Micro Devices sees first-quarter earnings and revenue falling below fourth-quarter results. Analysts, however, project earnings of 11 cents a share on revenue of $264.2 million. Shares fell 76 cents to $6.31.

Super Micro Computer

(SMCI) - Get Report

, a maker of computer servers, jumped 9.5% on its first day of trading. The company's initial public offering priced at $8 a share, below its proposed range of $9.50 to $11.50 a share. The offering of 8 million shares raised $64 million. Merrill Lynch led the underwriting syndicate. Shares rose 76 cents to $8.76.

Shares of

CDC

( CHINA) fell 8.1% after the Internet-services company posted in-line fourth-quarter earnings and backed its 2007 guidance. The company posted adjusted earnings of $8.8 million, or 7 cents a share, on revenue of $89 million. Analysts expected earnings of 7 cents a share on revenue of $87.7 million. During the year-earlier quarter, the company earned $6.4 million, or 6 cents a share, on revenue of $62.3 million.

Looking ahead, CDC continues to see 2007 adjusted earnings of $57 million to $62 million on revenue of $415 million to $420 million. Analysts project earnings of $60.2 million on revenue of $413.2 million. Shares were trading down 78 cents to $8.88.

ATMI

(ATMI)

slid 6.8% after the supplier of semiconductor materials slashed its first-quarter earnings and revenue guidance. The company now sees earnings of 17 cents to 21 cents a share on revenue of $80 million to $84 million. Previously, the company projected earnings of 28 cents to 32 cents a share on revenue of $84 million to $88 million.

Analysts project earnings of 30 cents a share on revenue of $86 million. "Our packaging business is experiencing a performance shortfall this quarter due to a manufacturing defect in one of its product lines which recently became apparent under certain use conditions," the company said. Shares closed down $2.23 to $30.68.

Shares of

Hoku Scientific

( HOKU) rose 0.7% after the maker of fuel cells and "clean energy" products secured a $13 million credit facility from the Bank of Hawaii. "This credit facility from Bank of Hawaii enables us to order our polysilicon reactors in time to meet our planned production and customer delivery schedule in early 2009," the company said. Shares closed up 4 cents to $5.93.

Other technology movers included

Sun Microsystems

(SUNW) - Get Report

, down 9 cents to $5.96;

Intel

(INTC) - Get Report

, up 23 cents to $19.09;

Cisco Systems

(CSCO) - Get Report

, down 27 cents to $25.43;

Microsoft

(MSFT) - Get Report

, up 11 cents to $27.75;

Oracle

(ORCL) - Get Report

, down 1 cent to $18.16;

Apple

(AAPL) - Get Report

, up 51 cents to $93.75;

Brocade Communications Systems

(BRCD)

, down 32 cents to $9.85;

CMGI

( CMGI), down 2 cents to $2.26; and

Sirius Satellite Radio

(SIRI) - Get Report

, which closed unchanged at $3.26.