ICHEON, South Korea (Reuters) -South Korea's SK Hynix said on Thursday that its high-bandwidth memory (HBM) chips used in AI chipsets were sold out for this year and almost sold out for 2025 as businesses aggressively expand artificial intelligence services. The Nvidia supplier and the world's second-largest memory chipmaker will begin sending samples of its latest HBM chip, called the 12-layer HBM3E, in May and begin mass producing them in the third quarter. "The HBM market is expected to continue to grow as data and (AI) model sizes increase," Chief Executive Officer Kwak Noh-Jung told a news conference.