Did you think AMD showed all its mobile GPU cards when it launched the Radeon HD 8000M series in January? Think twice. The company has just unveiled the 8900M series, an adaptation of its Graphics Core Next architecture for desktop replacement-class gaming laptops. To call it a big jump would be an understatement: compared to the 8800M, the flagship 8970M chip doubles the stream processors to 1,280, hikes the clock
