Shares of Advanced Micro Devices ( AMD) surged after the bell Thursday on news that Dell ( DELL) plans to include the AMD Opteron processor in its servers by the end of the year. The AMD chips will be in addition to Dell servers running Intel ( INTC) chips. Shares of the Sunnyvale, Calif.-based chipmaker gained $4.07, or 13%, to $35.42 in late trading. Intel shares, meanwhile, dropped 88 cents, or 4.7%, to $17.77 after hours.

In addition to the AMD news, Dell reported first-quarter earnings of $762 million, or 33 cents a share, down from $934 million, or 37 cents a share, a year earlier. Sales were up 6% year over year, at $14.2 billion. The results were in line with Dell's lowered projections given earlier this month. The computer maker said it expects second-quarter results to be similar to those of the first quarter. Analysts polled by Thomson First Call had forecast second-quarter earnings of 34 cents a share on revenue of $14.34 billion, suggesting Dell's guidance is slightly below current estimates. Still, shares advanced 85 cents, or 3.6%, to $24.80 after hours.

Red Robin Gourmet Burgers ( RRGB) retreated after the restaurant chain gave disappointing earnings guidance. For the first quarter, the company reported earnings of $7.4 million, or 44 cents a share, down from $8 million, or 48 cents a share, a year ago. Revenue increased 21% to $170.5 million from $141.2 million. Company-owned same-restaurant sales increased 4.8%. Analysts were looking for earnings of 44 cents a share on revenue of $169.7 million.

Red Robin expects second-quarter earnings of 37 cents to 40 cents a share, with revenue of $134 million to $135 million. Analysts predict second-quarter earnings of 43 cents a share and a top line of $136.4 million. For the full year, Red Robin predicted earnings of $1.70 and $1.78 a share, slightly down from its February guidance of $1.72 to $1.82. The company sees revenue of $590 million to $597 million. Wall Street anticipates earnings of $1.78 a share and revenue of $596.1 million. Shares fell $2.70, or 6.14%, to $41.30 recently.

Shares of Citi Trends ( CTRN) climbed after the apparel-and-accessory chain handily beat Wall Street's first-quarter earnings expectations. The retailer posted income of $6.9 million, or 49 cents a share, up from $3.3 million, or 30 cents a share, a year ago. Sales jumped to $91.7 million from $63.6 million, as same-store sales increased 21%. Analysts had forecast earnings of 38 cents a share and revenue of $85.2 million.

Citi Trends increased its fiscal 2006 earnings projection to $1.43 to $1.47 a share from a previously forecast $1.25 to $1.29. Wall Street targets earnings of $1.32 a share. Citi Trends shares rose $2.20, or 4.5%, to $50.82 in after-hours trading.

Supertex ( SUPX) surged as the mixed-signal semiconductor maker posted better-than-anticipated fiscal fourth-quarter results. For the quarter ended April 1, the company's earnings jumped to $5.1 million, or 37 cents a share, from $433,000, or 3 cents a share, a year ago. Sales ballooned to $24 million from $11.8 million last year. Analysts were looking for earnings of 32 cents a share on revenue of $22.2 million.

"We expect modest sequential growth in our first fiscal quarter over the prior quarter, double-digit growth over the same quarter last year, and double-digit growth for the new fiscal year over the last fiscal year," said Henry C. Pao, president and chief executive, in a statement. Shares climbed $3.89, or nearly 11%, to $40.50 after hours.

Shares of Nordstrom ( JWN) rose after the retailer posted a higher-than-expected jump in first-quarter profits and raised its full-year guidance. The high-end department-store operator earned $131.2 million, or 48 cents a share, in the quarter, up from $104.5 million, or 38 cents a share, a year earlier. Sales rose to $1.79 billion from $1.65 billion a year earlier, as same-store sales climbed 5.4%.

Looking ahead, Nordstrom forecast second-quarter earnings of 59 cents to 64 cents a share, in line with analysts' mean estimate of 62 cents. The company sees earnings per share of $2.24 to $2.32 for the full year, up from its February forecast of $2.15 to $2.23. Analysts project earnings of $2.26 a share for the year ending next February. Nordstrom shares rose 74 cents, or 2.1%, to $36.24 in after-hours trading.