美股盘前：超微电脑跌约4%，AMD涨约2%，诺和诺德涨约6%

Group 1 - Advanced Micro Devices (AMD) reported a revenue that exceeded expectations for the first quarter and provided a second-quarter revenue guidance that also surpassed forecasts, resulting in a stock increase of approximately 2% [1] - Super Micro Computer (Supermicro) experienced a decline of about 4% in its stock price after the company lowered its full-year sales forecast and acknowledged the impact of tariffs imposed by former President Trump [1] - Novo Nordisk's stock rose approximately 6% as analysts from JPMorgan noted that the company's decision to lower its earnings guidance for the year has already been reflected in its stock price [1]