ChangXin Memory Technologies (CXMT) reported progress on 4F² DRAM at a conference in Shanghai on October 10, 2026, and plans to introduce a next-generation DDR5 RDIMM for servers by the end of the year, according to DRAMX. The announcement links a denser cell design to a future server-memory product; the two are separate steps on the path to a commercial module.
What changes from 6F² to 4F²?
The reported 4F² design describes the area of a DRAM cell relative to F, the process’s minimum feature size. TradingKey compares it with the conventional 6F² layout and describes a theoretical cell-area reduction of about one-third. It also attributes an estimate of about 30% to Morningstar analyst Jing Jie Yu. These figures concern cell layout—not a measured increase in finished-module capacity or manufacturing yield, or a reduction in cost. TradingKey
| DRAM cell layout | Reported area | Meaning of the comparison |
| Conventional reference | 6F² | Baseline in the reported comparison |
| CXMT research architecture | 4F² | Theoretical cell-area reduction of about one-third versus 6F² |
The smaller layout could fit more cells into a given area, but a cell-level comparison does not establish a finished module’s capacity, yield or economics.
What CXMT plans for server memory
DRAMX describes the planned product as a next-generation DDR5 RDIMM—a registered memory module for servers—that combines 4F² DRAM with hybrid bonding. The report places the planned introduction by the end of 2026.
Server memory has demanding operating and compatibility requirements. DRAMX says RDIMMs must support continuous 24/7 operation and undergo hundreds of compatibility tests with CPUs and motherboards. Those requirements make clear why a denser cell design is one part of the job: a server module also has to work reliably across system configurations.
The planned product is a DDR5 RDIMM; HBM is a separate memory segment. NeoTeo previously examined HBM pressure on Chinese AI accelerators in a separate report.
A longer research effort
DRAMX traces CXMT’s work on 4F² to an academic paper in 2021, followed by further research disclosures in 2023 and 2025. The October 2026 progress report is part of that longer research history.
TradingKey also reported declines in memory-related shares on October 12 while discussing investor concern about CXMT’s plan. Those market movements provide context for the announcement, rather than a measure of what the proposed module will deliver.
