美股开盘，道指涨0.19%，标普500指数涨0.45%，纳指涨0.72%。芯片股普涨，英伟达(NVDA.O)涨2.6%，其Q4总营收、AI业务营收及下季度营收展望均超预期；博通(AVGO.O)涨1.8%，Arm(ARM.O)涨2.7%。
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