OpenAI has signed letters of intent with Samsung Electronics and SK Hynix to supply memory for the Stargate project, the $500 billion data-center venture with Oracle and SoftBank. The letters of intent were signed in Seoul on Wednesday after meetings involving OpenAI chief executive Sam Altman, South Korean President Lee Jae-myung, Samsung executive chairman Jay Y. Lee and SK chairman Chey Tae-won.

OpenAI has requested volumes equivalent to as many as 900,000 DRAM wafers a month. SK Group said that figure is more than double current capacity for high-bandwidth memory chips, and Tom’s Hardware says the figure could amount to about 40% of projected 2025 DRAM wafer capacity. Samsung and SK Hynix together hold nearly 80% of the HBM market, according to Counterpoint Research.

The deal extends beyond memory. Samsung SDS will collaborate on data-center design and operations and resell OpenAI services in Korea; Samsung C&T and Samsung Heavy Industries will explore floating offshore data centers; and SK Telecom will work with OpenAI on a domestic AI data center. The Korean Ministry of Science and ICT is also in talks with OpenAI about facilities outside Seoul. Samsung and SK Group will integrate ChatGPT Enterprise and OpenAI APIs into their operations.

It is the latest in a month of compute announcements from OpenAI, following Nvidia’s planned investment of up to $100 billion and a five-site data-center buildout with SoftBank and Oracle.