The Chinese memory makers are now picking clients and dictating prices, four people familiar with the matter told Reuters. The Chinese companies' grip on chip supply is putting them on a collision course with Washington. Despite their growing dominance, the Chinese memory makers face constraints. The Chinese memory makers' Korean and American competitors make DRAM chips using ASML's more-advanced extreme ​ultraviolet lithography machines. "China remains quite behind in that part of the equipment supply chain compared to other tool segments."