CXMT's Fastest LPDDR5X Chip Enters Mass Production, Debuts in Nubia NaviX Ultra
ChangXin Memory Technologies, China's leading DRAM manufacturer, announced Thursday that its highest-speed LPDDR5X memory chip — running at 10,667 Mbps — has entered mass production and will debut in the Nubia NaviX Ultra smartphone, marking the first commercial deployment of a domestically produced chip at that speed tier.
The announcement, made via CXMT's official social media account on September 4, signals a meaningful step in China's push toward self-sufficiency in high-end mobile memory. The 10,667 Mbps LPDDR5X chip offers roughly 25% greater bandwidth compared to the mainstream 8,533 Mbps variant currently prevalent in the market, while consuming 30% less power than its LPDDR5 predecessor — a combination that addresses both performance and battery-life demands in flagship handsets.
CXMT's LPDDR5X product line now spans three speed tiers: 8,533 Mbps, 9,600 Mbps, and 10,667 Mbps. The two lower tiers entered mass production in May 2026. With the 10,667 Mbps variant now shipping, the company has achieved full-spectrum coverage from mainstream to flagship-grade mobile DRAM — and, according to the company, has drawn level with leading international memory suppliers at the top of the speed range.
The timing of the announcement is notable. Less than a week earlier, on August 29, CXMT disclosed that its next-generation LPDDR6 chip — rated at 12,800 Mbps — had begun mass production and would first appear in Xiaomi's Mi 18 Fold foldable flagship. The back-to-back launches suggest CXMT is deliberately tiering its product portfolio across multiple customers and price segments: LPDDR6 for ultra-premium foldables, LPDDR5X at 10,667 Mbps for high-end AI-focused handsets.
The Nubia NaviX Ultra itself is positioned as the world's first mass-market AI agent smartphone, jointly developed by ZTE and ByteDance, and equipped with ByteDance's Doubao mobile assistant. The device has received network access approval from China's Ministry of Industry and Information Technology and is scheduled to go on sale in September. Hardware specifications include a Qualcomm Snapdragon 8 Elite Gen5 processor, a 6.78-inch 1.5K OLED display with 144Hz refresh rate, a 7,100 mAh battery with up to 100W wired fast charging, and a triple rear camera system anchored by a 50-megapixel main sensor.
On the AI side, the phone's Doubao assistant operates through a system-level GUI Agent architecture, enabling autonomous cross-application tasks — including search, price comparison, form-filling, and payment — based on voice commands. A dedicated physical AI button allows users to invoke the assistant without unlocking the device.
From a financial perspective, the commercial traction is material. CXMT's half-year report showed LPDDR-series revenue of RMB 78.191 billion yuan (approximately US$10.8 billion) in the first half of 2026, accounting for more than half of total DRAM product revenue of RMB 150.310 billion yuan. The Nubia design win adds incremental volume to the high-end LPDDR revenue line at a point when CXMT is simultaneously ramping LPDDR6 — a dynamic that could further shift its product mix toward higher-margin tiers in the second half of the year.
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