China has summoned Nvidia to address alleged H20 chip security flaws, raising fresh concerns about the AI giant’s China business.

Trump said on Monday that he might allow Nvidia to sell a more advanced artificial intelligence chip in China based on the chipmaker’s latest and most advanced Blackwell platform. The performance of H20 chips sold to China is restricted compared with those more advanced processors sold to customers in the US.

Beijing has reportedly sent notices to a range of firms, including state enterprises and private companies, discouraging purchases of the H20, Nvidia’s less-advanced AI accelerator approved for sale i

A Fragile Foothold in China Nvidia (NASDAQ:NVDA) and Advanced Micro Devices (NASDAQ:AMD) recently secured U.S. approval to resume sales of their lower-end AI chips, the H20 and MI308, respectively, to China,

After another meeting between Trump and Huang, H20 chips can be exported. Meanwhile, the black market for AI accelerators is flourishing.