China's Chip Yields Trail Global Rivals Amid AI Push

ChangXin Memory Technologies (CXMT) plans to commence production of HBM3E, a vital high-bandwidth memory chip for AI processors, despite an alarmingly low usable chip rate of approximately 20%. This move underscores China's urgent need for domestic AI memory solutions, driven by US trade restrictions that limit access to foreign-made technology. CXMT, already China's largest DRAM maker, has provided HBM3E samples to local AI chip developers and anticipates limited production within the next two months.

Global leaders like SK Hynix achieve yields around 70%, significantly higher than CXMT's current 20-30%. This disparity makes production costly for CXMT, as a large portion of manufactured chips are unusable. The difficulty in producing HBM technology reveals a considerable gap between CXMT and industry giants such as SK Hynix, Samsung, and Micron, who dominate the global market. CXMT's HBM3E performance has been noted to be closer to SK Hynix's previous-generation HBM3, placing it at least one generation behind commercial HBM production.

The push for domestic HBM3E is critical for China's AI ambitions, particularly in developing alternatives to Nvidia's processors at scale. US export controls, tightened in December 2024, have further complicated access to these advanced components. Chinese AI chipmakers have already faced increased costs and production delays due to memory shortages, with some reportedly raising prices by up to 50%. CXMT's HBM3E is expected to be more expensive than comparable foreign products, reflecting the challenges and costs associated with its development and production.