Micron Technology (NASDAQ: MU) and SanDisk (NASDAQ: SNDK) investors face a new test on Monday after China’s CXMT moved its latest DRAM technology into mass production, challenging one of the assumptions behind this year’s powerful memory-stock rally.
CXMT says its fifth-generation process can produce at least 50% more dies per wafer than its previous platform while improving power efficiency and manufacturing economics.
The immediate competitive threat is greater for Micron, whose business remains heavily tied to DRAM.
SanDisk’s exposure is less direct, but CXMT is also preparing a separate push into NAND.
CXMT has moved from promise to production
CXMT’s announcement matters because the company is no longer merely demonstrating advanced DRAM in a laboratory.
Its G5 platform has entered mass production, using quadruple patterning to achieve an active-area half-pitch of 11.95 nanometres. Two new 24Gb LPDDR5X products are also being produced on the platform.
CXMT says the process lifts gross dies per wafer by at least 50% from its fourth-generation technology, potentially lowering unit costs as production scales.
The company is already becoming harder to ignore. Its share of global DRAM revenue reached about 9.5% in the second quarter, according to industry data, making it the fourth-largest supplier.
Yet better technology does not mean immediate customer displacement.
Lynx Equity Research analyst KC Rajkumar, quoted by Investing.com after an earlier CXMT-related selloff, called that reaction “an overreaction”, citing qualification gaps, supply constraints and weaker yields.
Micron needs the shortage to outlast CXMT’s ramp
Micron’s extraordinary rerating has rested partly on the view that AI demand will keep DRAM and NAND supply tight even as manufacturers expand capacity.
UBS analyst Timothy Arcuri’s latest checks still support that argument.
TipRanks quoted Arcuri as saying pricing dynamics were “strengthening” across both core DRAM and NAND, with shortages potentially lasting through calendar 2027 and even into 2028, particularly for DRAM.
That is precisely the assumption CXMT is beginning to test.
The Chinese producer does not need to flood global markets tomorrow to matter for Micron’s valuation.
If its wafer productivity improves sharply and market share keeps climbing, investors may start shortening the period over which they expect scarcity-driven pricing to last.
For now, conditions remain unusually tight. Intel Chief Executive Lip-Bu Tan recently said memory prices had risen five- to sevenfold as AI demand strained supply, with pressure expected to persist.
The near-term bull case therefore remains intact. CXMT’s significance lies in what it could do to the duration of that cycle.
SanDisk faces a later but strategically important risk
SanDisk’s exposure requires more caution. CXMT is not yet mass-producing NAND.
Reuters reported on September 18 that the company plans an R&D production line at a new Beijing facility and has spoken with prospective customers, but the timetable for commercial-scale output remains unclear.
That still matters because NAND economics have improved dramatically.
Counterpoint data cited by Barron’s put SanDisk’s second-quarter global NAND share at about 11%, while Chinese rival YMTC already controlled roughly 14%.
JPMorgan analyst Harlan Sur has argued that SanDisk is “uniquely positioned” to benefit from a structural increase in NAND demand driven by AI inference.
His bullish thesis also rests on long-term customer agreements that reduce cyclicality and support higher margins.
A well-funded new Chinese entrant would eventually test both assumptions.
CXMT is unlikely to erase the memory shortage overnight. Micron still benefits from tight DRAM supply, while SanDisk has AI-driven demand and multiyear contracts behind it.
But the weekend announcement changes what investors must watch: how quickly Chinese capacity can make that scarcity less durable tomorrow.
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