Memory stocks sold off as SanDisk fell 7%, while CXMT unveiled a next-generation DRAM architecture that Morningstar says still faces major commercialization hurdles.
The memory stocks sold off across the board on October 12 (US Eastern Time) as market concerns grew over the next-generation DRAM architecture introduced by Chinese DRAM maker ChangXin Memory Technologies (CXMT) and its plans to launch related server memory products by year-end. The reaction reflected fears of intensifying competition in future server memory.
According to data from market research firm Counterpoint, based on global DRAM vendor revenue, ChangXin Technologies held a 7% market share in the second quarter of 2026, ranking fourth globally. If the technology is successfully commercialized, ChangXin is expected to lower its unit memory costs, which would put pressure on the market shares and profit margins of existing vendors.
As of press time, the Roundhill Memory ETF (DRAM) fell 4.61%, SanDisk (SNDK) fell 7.12%, SK Hynix (SKHY) fell 4.20%, Micron Technology (MU) fell 4.70%, Seagate Technology (STX) fell 3.18%, and Western Digital (WDC) fell 2.44%.
ChangXin Memory Technologies President Kanyu Cao stated on October 10 that the company expects to launch next-generation DDR5 RDIMM products featuring the 4F² architecture by the end of the year. The commercial significance of this advancement lies primarily in the memory cell area. Mainstream DRAM currently uses the 6F² architecture, where F represents the minimum feature size in the process. At the same F value, transitioning from 6F² to 4F² can theoretically reduce the area of a single memory cell by approximately one-third. Morningstar analyst Jing Jie Yu also noted that the new structure announced by ChangXin reduces memory cell area by about 30%.
For DRAM manufacturers, a smaller memory cell area is expected to increase memory output per wafer. If mass-production yields remain stable and additional process costs do not offset the gains from higher density, bit costs should decline. As a result, ChangXin may gain greater pricing flexibility or improve profit margins at the same selling price.
A key innovation introduced by ChangXin is the Vertical Surround Gate (VSG) transistor architecture. By enabling the gate to control electrical current more effectively, this structure aims to reduce leakage current and short-channel effects, while its vertical layout helps shrink the planar area occupied by transistors. This offers a new technological path for DRAM to keep increasing density as traditional scaling becomes more difficult.
A gap nonetheless remains between technical breakthroughs and successful mass-production commercialization. Morningstar analysts believe it could be "extremely difficult" for ChangXin to commercialize this structure, with consistency during volume production among the primary challenges. Performance achieved at the experimental or sample stage must be stably replicated in continuous production to translate into qualified products and actual profits.
Therefore, while a product launch by year-end is a milestone worth watching, it cannot yet be inferred that ChangXin will achieve large-scale, low-cost supply by then. RDIMM is a widely used memory module format in servers, and its requirements encompass not only speed but also long-term stability, reliability, and compatibility with server platforms. International memory giants have built strong customer and engineering advantages in this field, so to expand market share, ChangXin must clear the dual hurdles of manufacturing and customer qualification.
For existing DRAM vendors, the potential pressure comes from both cost and supply. If ChangXin achieves stable mass production and expands supply, lower unit costs could help it win orders, while the addition of effective supply could also weigh on DRAM prices.
Assessing the actual impact of ChangXin's announcement on memory stocks, however, requires evaluating each manufacturer's product mix. The potential competition facing server DDR5 cannot be directly equated with an equivalent impact on HBM businesses. Going forward, the factors that will truly determine competitive pressure are ChangXin's mass-production yields, customer qualification, and actual supply scale.