Five things to know ahead of today's opening bell. Chinese internet authorities have reportedly told the country's tech giants to stop buying all AI chips from Nvidia and to cancel existing orders. The FT says that this includes a new a new chip custom made for China.This is something that they apparently would like to see them buying Chinese-made chips instead. They think that they are equitable to the H2O or H20 chip coming from China. CNBC has reached out to Nvidia for comment.Mortgage rates dropping sha ...