存储芯片周度跟踪：服务器DDR4上涨，SK海力士完成HBM4开发量产-20250918

Investment Rating - The industry investment rating is maintained as "Add" [6] Core Viewpoints - The report highlights a strong demand for DDR4 modules, particularly driven by AI and networking-related IPC customer needs, which is expected to boost overall revenue performance [2][26] - SK Hynix has successfully completed the development and mass production of HBM4, which features double the data transmission channels compared to the previous generation, significantly enhancing bandwidth and energy efficiency [2][27] - The supply of server DDR4 remains tight, leading to an increase in DDR4 RDIMM prices this month, with expectations of continued price increases in Q4 2025 due to supply constraints in DDR5 [3][28] Summary by Sections NAND - SK Hynix has begun supplying its mobile NAND flash solution ZUFS 4.1, which utilizes zoned storage technology to enhance data management efficiency and operating system speed [1][26] - The average price fluctuation for 22 types of NAND particles ranged from -7.56% to 7.91%, with an average change of -0.06% [1] DRAM - The average price fluctuation for 18 types of DRAM ranged from -0.37% to 4.51%, with an average increase of 1.68% [2] - The demand for DDR4 modules is particularly strong, with positive outlooks for the second half of 2025 [2][26] HBM - SK Hynix's HBM4 product is expected to improve AI service performance by up to 69% and features a data processing speed exceeding 10 Gbps [2][27] Market Dynamics - The report indicates that the server DDR4 market is experiencing a supply shortage, which is driving prices up [3][28] - The DDR5 market is currently stable, but supply tightness is anticipated to lead to price increases in the future [3][28] Investment Recommendations - The report recommends focusing on companies benefiting from the rapid development of advanced computing chips in the HBM industry, such as Saiteng Co., Yishitong, and Lianrui New Materials [4] - For the storage chip sector, companies like Dongxin Co. and Zhaoyi Innovation are highlighted as potential investment opportunities due to recovering inventory levels and rising demand driven by AI [4]