美股盘前科技股普涨，美光科技涨约3%，AMD涨约3%

Group 1 - The core viewpoint of the article highlights a pre-market rally in technology stocks in the US, with notable gains for Micron Technology, AMD, and Nvidia [2] - Micron Technology saw an approximate increase of 3% [2] - AMD also experienced a rise of about 3% [2] - Nvidia's stock increased by around 2% [2] Group 2 - Chinese concept stocks also showed positive performance, with Baidu rising approximately 4% [2] - Alibaba's stock increased by about 2% [2]