Advanced Micro Devices Inc. said it expects to take a charge of as much as $800 million after the Trump administration put new restrictions on semiconductor exports to China.

The company came to the conclusion after it completed an initial assessment of a new license requirement for the export of its MI308 products, it said in a filing with the US Securities and Exchange Commission. Nvidia Corp. said Tuesday in a similar disclosure that it will take a writedown of $5.5 billion because its H20 chip will be banned from export to China unless it secures a license.

AMD said it will seek licenses to export to customers in China, but cannot be sure it will receive them.

Shares of AMD fell as much as 8.1% after markets opened in New York on Wednesday. Nvidia’s stock similarly declined as much as 7%.

Donald Trump’s administration is building on regulations that the US government has implemented in recent years to restrict China’s access to advanced semiconductors. The Biden administration levied several rounds of controls because of what it saw as national security threats from a geopolitical rival.

AMD was already a smaller player in this space, even before the latest export controls. Rival Nvidia commands over 90% of the market for data center graphics processing units, the market research firm IDC said last month.