Nvidia faces a $4.5 billion charge in Q1 due to licensing requirements impacting its ability to sell H20 AI chip to Chinese companies.An additional $2.5 billion of H20 revenue in the quarter was unable to be shipped due to restrictions.The H20 licensing requirements are expected to result in an $8 billion hit to Nvidia's revenue in Q2.Despite Biden's chip export rules not coming into effect, Nvidia is impacted by the attempt to stifle China's AI market.