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.