The H200 was cleared by Commerce for export to China in December and got finally approved this week.
They are much more powerful than anything on the Chinese market, and Nvidia received so many orders, they ran out.
Though the sources from Reuters say officials have not given any reason for this ban, it is likely in order to protect their domestic chip industry.
They do say that chips can be bought «when necessary» or for research and development programs with Chinese universities.
Read the full scoop at Reuters.