Chinese memory maker CXMT has landed its high-end DRAM chips inside a flagship smartphone for the first time, a milestone in Beijing’s push to break the Samsung and SK Hynix duopoly on advanced mobile memory. The Nubia NaviX Ultra, which went on sale Wednesday, uses LPDDR5X chips from ChangXin Memory Technologies with data transfer speeds of up to 10,667 megabits per second, according to an announcement the companies made earlier this month.
The handset, priced from 5,999 yuan, or about $885, is backed by ZTE and integrates ByteDance’s Doubao AI assistant, which ZTE claims makes it the first mass-market smartphone with a built-in AI agent. The phone responds to spoken instructions and carries out tasks on the user’s behalf, which puts sustained pressure on memory bandwidth, one reason the DRAM sourcing matters for the product’s pitch.
The South China Morning Post reported the tie-up marks the first large-scale use of domestically made LPDDR5X at that performance level. Until now, Chinese phone makers wanting flagship-grade memory had to buy from Samsung or SK Hynix, both South Korean, or Micron of the US. Nubia’s switch to CXMT parts is a small order in absolute terms, but a large one symbolically and strategically.
Why memory matters right now
The timing is not accidental. The global memory market is in a shortage, driven by AI data centers absorbing DRAM and NAND supply at record rates. Tom’s Hardware reported TSMC’s fab equipment demand nearly doubled in six months as AI spending pushed 2026 capital expenditure toward $64 billion amid tool shortages, and the same demand wave has squeezed memory pricing and availability across the industry. Memory and storage futures have become a trading theme in their own right, with MEXC reporting that storage and memory stocks led big tech earnings trading volumes.
For Chinese phone vendors, the shortage turned a nationalistic preference into a practical necessity. Domestic supply means allocation priority when global memory is tight, and CXMT has been scaling fast. The company’s progress has been rapid enough that South Korean courts are now involved in disputes over how it got there.
A recent report from Tom’s Hardware said a South Korean court case alleges CXMT used a written roadmap to lift Samsung DRAM technology, with prosecutors describing a project, labeled ‘Project Hefei’, that copied a 620-step manufacturing recipe and helped CXMT build roughly 10% global market share. Samsung has pursued the case as industrial espionage. CXMT has denied wrongdoing, and the legal process is ongoing, but the allegation underscores how seriously incumbents take the threat.
From budget chips to flagship parts
CXMT started years ago making commodity DDR memory for PCs and low-end phones, the kind of product where price matters more than speed. LPDDR5X is a different tier. It is the memory class used in current iPhone and Galaxy flagships, where power efficiency and bandwidth directly affect camera processing, gaming and on-device AI performance.
Reaching 10,667 Mbps puts CXMT’s product at the top of the current LPDDR5X spec, matching what Samsung and SK Hynix ship in their own flagship-tier parts. The next generation, LPDDR6, is where the Korean suppliers hold their lead, and CXMT is not there yet. The gap between matching a current spec and leading the next one is where the real competition will be decided.
The Nubia phone is a proof point rather than a volume shift. One model using one supplier’s chips does not change the market, but it establishes that the chips work at flagship level and that a major vendor is willing to stake a premium product on them. Xiaomi and other Chinese makers are reportedly evaluating CXMT parts for their own top models, per the SCMP report, and the Doubao-integrated Nubia device gives the supplier a public reference design to point to.
The AI phone angle
There is a second story inside the first. The NaviX Ultra is being marketed on its AI agent, ByteDance’s Doubao assistant running on-device. AI features are memory hungry. Language models running locally need fast RAM to hold model weights and context, and phones that promise agentic behavior, executing multi-step tasks for the user, need more of it than phones that just run apps.
That makes memory sourcing a competitive differentiator for AI phones, not just a cost line. If a vendor can secure enough fast memory at a stable price while competitors queue for Samsung allocation, it can ship AI features cheaper or sooner. Chinese vendors pushing AI agents hard, as ByteDance’s partners are, have an added reason to line up behind CXMT.
The bigger picture
The development fits the broader pattern of Chinese semiconductor substitution under US export controls. Huawei’s Ascend AI chips have pushed domestic AI accelerator production, SMIC has advanced mature-node logic, and now memory is following. Each segment that localizes reduces the leverage export controls carry, because the restricted alternative is no longer the only option.
For Samsung and SK Hynix, the near-term risk is limited. Both still dominate high-bandwidth memory for AI accelerators, the most profitable segment, and their mobile DRAM holds the premium Western and Korean accounts. The risk is longer term and mirrors what happened in displays and batteries, where Chinese manufacturers started at the low end, learned at scale, and eventually took the top of the market.
The memory shortage gives that process a tailwind. When supply is scarce, buyers who once would not consider a new supplier suddenly take meetings. CXMT’s LPDDR5X landing in a flagship phone is what those meetings produce, and the shortage is forecast to persist well into next year.