CXMT begins HBM3E risk production while still two generations behind rivals

CXMT has reportedly begun risk production of HBM3E memory, marking a milestone in China’s bid to reduce dependence on Western AI memory technology while acknowledging the gap to South Korean leaders. The effort places CXMT roughly two generations behind SK hynix, Samsung, and Micron, but signals a significant step toward domestic capacity, with plans to reach around 350,000 DRAM wafers per month by year’s end and eventually 600,000 per month after new plants come online. Technical specs from JEDEC indicate HBM3E’s 1,024-bit interface and speeds around 9.2 to 12.4 Gbps per pin, delivering about 1.2 TB/s of bandwidth and configurations at 24 GB or 36 GB. Industry reporting notes CXMT is rapidly expanding its fabs, building cleanrooms in roughly 12 months and operating two 12-inch facilities in Hefei and Beijing, though current output remains constrained and highly dependent on risk-to-mass-production progression. Yield challenges are evident, with early HBM3 production reportedly around 25% yields, underscoring the costs and delays typical when scaling to mass production for a new memory class. If CXMT succeeds, the shift could keep consumer DRAM prices elevated as production prioritizes data-center AI memory, while long-term gains hinge on advancing yields and closing the gap with leading fabs.