China's CXMT Declares Mass Production of 11.95nm Fifth-Generation DRAM Using Quadruple Patterning, Bypassing US Export Controls to Compete Directly With Samsung and SK Hynix

Chinese memory chipmaker ChangXin Memory Technologies announced on September 20, 2026 at the World Manufacturing Convention in Hefei that its fifth-generation G5 DRAM platform had entered mass production, achieving 11.95-nanometer cell spacing using quadruple patterning lithography rather than the extreme-ultraviolet machines the United States has banned from export to China. CXMT Vice President Luo Xiaodong stated that the company's process capability is now on par with the most advanced mass-produced nodes out there in the industry. The new platform delivers at least 50 percent more gross chip dies per wafer than CXMT's fourth-generation technology, and the company unveiled two 24-gigabit LPDDR5X products already shipping in Chinese flagship smartphones, each capable of storing 50 percent more data than prior equivalent chips. CXMT operates three 12-inch DRAM fabrication facilities running at 300,000 wafers per month as of September 2026 and has emerged as the world's fourth-largest DRAM producer with backing from state-owned shareholders, serving Chinese smartphone, PC, and server manufacturers. This matters because it demonstrates that US semiconductor export controls, specifically the 2023 ban on ASML shipping EUV lithography machines to Chinese foundries, have failed to prevent China from reaching leading-edge DRAM manufacturing capability for the memory used in flagship consumer electronics. Washington's export control policy rested on the assumption that without EUV, Chinese manufacturers could not produce advanced DRAM—CXMT has now falsified that assumption using older deep-ultraviolet technology with quadruple patterning, a process that repeats manufacturing steps to produce finer circuit patterns. The company's July IPO on Shanghai's STAR Market raised 8.6 billion dollars at 212 times oversubscription and briefly pulled several billion dollars off Micron and SK Hynix's combined market capitalization in a single session, indicating that financial markets