Xiaomi 18 Fold Will Ship the First LPDDR6 Memory, at 12,800 Mbps
Chinese memory maker ChangXin Memory Technologies (CXMT) confirmed on August 29 that it has begun mass production of LPDDR6, and Xiaomi says its next foldable, the Xiaomi 18 Fold, will be the first phone to ship with it. The new memory standard peaks at 12,800 Mbps and scales up to 16GB per chip, a jump CXMT is making less than a year after it started mass-producing LPDDR5X.
What CXMT actually shipped
LPDDR6 is the successor to the LPDDR5X memory found in most current flagship phones, and CXMT's version reaches a peak transfer rate of 12,800 Mbps with individual chips scaling to 16GB. The company has moved fast to get here: it entered mass production of LPDDR5 in 2023, followed that with LPDDR5X in the first half of 2025, and has now reached LPDDR6 barely a year later. Mobile memory already carries CXMT's business — LPDDR chips made up 69.74% of its core revenue in the first half of 2025, worth roughly RMB 10.62 billion.
The chip that pairs with it
Xiaomi CEO Lei Jun confirmed the LPDDR6 pairing is tied to the company's in-house Xring O3 processor, which the company revealed on August 24. The O3 is built on TSMC's 3nm N3P process, the same node family as its O1 predecessor, but packs roughly 24 billion transistors on a 133mm² die — up from 19 billion transistors and 109mm² on the O1. Reporting from Reuters indicates the O3 is already in mass production, with an initial run targeted at 200,000 to 300,000 units, well short of what a global flagship launch usually needs.
Why the timing is tight
The Xiaomi 18 Fold is set to launch in September 2026, which leaves a narrow window between CXMT's mass-production announcement and phones reaching shelves. It also arrives while phone memory costs are already under pressure industry-wide — a squeeze that has pushed Google to raise Pixel 11 prices, contributed to reported cost increases on the iPhone 18 Pro, and driven Xiaomi itself to raise prices in Japan earlier this month. A domestic Chinese supplier reaching the newest LPDDR standard first gives Xiaomi a memory source that isn't as exposed to the same global shortage dynamics, at least for this one device.
What this does not confirm yet
Neither CXMT nor Xiaomi has published pricing, exact RAM configurations, or a firm release date beyond "September." The Xring O3's limited initial production run also means the Xiaomi 18 Fold is likely to launch first in China, with wider availability dependent on how quickly CXMT can scale LPDDR6 output beyond this single flagship. Xiaomi is also working with TSMC on two more chips — a 6nm O100 neural processing unit and a 3nm D100 for automotive use — though both are aimed at 2027 rather than this launch.
Why it matters beyond one phone
If CXMT's LPDDR6 output scales the way its LPDDR5X did, it opens a second commercial source for the newest mobile memory standard outside Samsung, SK Hynix, and Micron. For buyers, that competition is the more useful outcome than the Xiaomi 18 Fold itself, since it is what eventually decides whether next-generation RAM shows up in phones at a reasonable price or adds to the increases already rippling through the wider memory market.
Frequently Asked Questions
What is LPDDR6 and how is it faster than LPDDR5X?
LPDDR6 is the next mobile memory standard after LPDDR5X, and CXMT's version reaches a peak transfer rate of 12,800 Mbps with individual chips scaling up to 16GB. That is a generational jump in bandwidth over the LPDDR5X memory used in most current flagship phones.
When does the Xiaomi 18 Fold launch?
Xiaomi has confirmed a September 2026 launch window but has not given an exact date, pricing, or RAM configurations yet.
What chip powers the Xiaomi 18 Fold?
The Xiaomi 18 Fold uses Xiaomi's in-house Xring O3 processor, built on TSMC's 3nm N3P process with about 24 billion transistors on a 133mm² die, up from 19 billion transistors on the previous Xring O1.
Is CXMT's LPDDR6 exclusive to Xiaomi?
Xiaomi is the first confirmed customer through its Xring O3 chip, but reporting so far only confirms this initial pairing. Reuters reports the O3's first production run is limited to 200,000 to 300,000 units, so wider availability of CXMT's LPDDR6 in other phones is not yet confirmed.
Does this affect phone RAM prices?
Not directly yet, but it matters for the broader memory market. Phone memory costs have already pushed price increases at Google, Apple's supply chain, and Xiaomi itself, and a second commercial source for the newest LPDDR standard could ease some of that pressure over time if CXMT scales production.
