Memory Stocks Drop After CXMT's 4F² Reveal. Will PC RAM Prices Finally Fall?

Memory stocks fell hard on Tuesday, 13 October. SK Hynix dropped more than 10%, Samsung Electronics lost 7.4% and SoftBank 8.5%, and Micron was down about 5% in premarket trading. The trigger was China's CXMT, which showed a new DRAM cell architecture at the weekend and said it plans server DDR5 modules built on it by the end of the year. If you are building a PC, the question that matters is whether RAM prices are finally about to drop. On the available data, not this year.

What CXMT showed

CXMT president Cao Kanyu presented the company's 4F² DRAM architecture on 10 October at the Integrated Circuits and Chiplet Conference. The industry mostly builds memory with a 6F² cell, and 4F² shrinks the cell's footprint from six squares of the minimum feature size to four. Chinese reports cited by TrendForce say that could raise density by 30% to 50% in the same area. The design uses a vertical surrounded-gate transistor, builds the cell array separately from the peripheral circuitry and joins the two with hybrid bonding. CXMT says it holds more than 300 patent families on the technology.

That is the extent of what we know. The first product is meant to be server DDR5 RDIMMs by year-end. There is no mass-production date, no capacity and no speed, and reports cited by TrendForce suggest the first parts may only partly use 4F². Nothing was said about memory for desktop PCs. CXMT is also not racing alone: Samsung showed a 16Gb 4F² prototype at ISSCC 2026 but reportedly favours hybrid bonding and does not expect a market launch before 2028, and SK hynix is working on its own vertical-gate 4F² DRAM.

Why the stocks reacted so sharply

CXMT is now the world's fourth-largest DRAM maker, and its share keeps climbing. Tuesday's sell-off hit the whole sector because investors found an excuse to take profits on AI-linked shares that have run hard this year, memory most of all. UBP strategist Vey-Sern Ling told CNBC that the market was looking for exactly such reasons, and that in the short run Chinese makers still face technology hurdles, especially in HBM. Elon Musk added fuel on Monday by saying that once China figures out how to make something, its ability to scale is often greater than the rest of the world's combined. CXMT's own shares closed 2.8% lower in Shanghai.

The size of the margins explains why the sector is so sensitive. Samsung reported preliminary third-quarter results on Thursday, 8 October: an operating profit of 107.4 trillion won, about 80 billion dollars and 782.5% more than a year earlier, on an operating margin of 55.1%. At that margin, any hint of new competition is enough to trigger a sell-off.

What it means for shop prices

TrendForce's latest forecast, from 30 September, is unambiguous. Conventional DRAM contract prices are projected to rise 10% to 15% quarter on quarter in the fourth quarter, and suppliers are still steering advanced capacity toward server products. PC makers are buying aggressively because they expect supply to stay tight in 2027, and DRAM supply for PCs could even shrink next year as capacity moves to servers. Consumer memory prices should keep rising, only more slowly. Wafer prices are at historic highs, and retail channels are finding them harder and harder to absorb.

Polish shops show it already. A DDR5 buying guide from the Polish site GRYOnline, updated on 1 October, notes a sharp jump in RAM prices over the previous two weeks, says nothing points to DDR5 getting cheaper, and calls a decent 16 GB kit below 1,100 to 1,150 zloty practically unrealistic. G.Skill Flare X5 16 GB DDR5-6000 CL30 cost about 1,460 zloty at morele.net at the time. We covered the DRAM price-fixing lawsuit separately, and the knock-on effect of dearer memory on consoles in our piece on the Switch 2 price increase.

In our view Tuesday's market drop has no bearing on what you will pay for RAM before the end of the year. Shares react to a threat to the makers' margins, and shop prices do not follow them. The first 4F² product is a server RDIMM with no mass-production date, no specifications and a caveat that it may use the new architecture only in part. PC memory is not mentioned in a single announcement.

CXMT matters to gamers over the longer term. The fourth maker's share rises every quarter and should eventually push down conventional DRAM prices. But TrendForce's fourth-quarter forecast shows no trace of that effect, and for 2027 its analysts talk about continued shortages and a possible drop in DRAM supply for PCs.

If you are building a PC now, buy the modules you need and do not wait for a price cut driven by the stock market. Do not pay extra for capacity you will not use. We are not judging the value of any shares here: this is about what the announcements mean for someone buying hardware.