- What happened: On October 12, Elon Musk said China appears to be rapidly mastering manufacturing technology for LPDDR5 and LPDDR6 memory.
- Why it matters: Chinese DRAM maker CXMT has already announced mass production of LPDDR6 and its adoption in a Xiaomi smartphone, which could widen the pool of suppliers for next-generation memory.
- What to watch: Peak memory speed alone is not enough. Performance when paired with an SoC, the growth in products that adopt the memory, and stable mass-production and supply capacity will be key factors.
On October 12 (October 13 in Japan), Elon Musk posted on X that China appears to be rapidly mastering the manufacturing technology for LPDDR5 and LPDDR6. He argued that once China has established how to make a product, it can expand production capacity on an overwhelming scale. At the same time, he said difficult challenges remain, including cooling, for next-generation high-bandwidth memory (HBM) and for technologies that stack memory and logic chips in three dimensions.
The remarks come against the backdrop of Chinese memory makers rapidly improving their technical capabilities.
China's DRAM maker CXMT (ChangXin Memory Technologies) has already announced mass production of "LPDDR6," the next-generation low-power memory, and has also revealed that it is being used in Xiaomi's foldable smartphone, the "Xiaomi 18 Fold."
However, developing a product that supports a new standard is a different matter from mass-producing it at a competitive price and supplying it continuously.
To judge how far China's memory industry has progressed, it is necessary to look not only at support for the standard, but also at the performance it delivers in actual devices and at its mass-production capability.
Elon Musk praises China's memory manufacturing technology and production capacity
Musk was replying to an X post discussing CXMT's technology development and the decline in memory-related stocks, and he spoke about the mass-production capability of Chinese manufacturing.
According to Musk, once China establishes how to make a product, it can sometimes expand production capacity to a scale exceeding that of the rest of the world combined.
He cited lithium-ion batteries and solar power as examples.
In these industries, Chinese companies established manufacturing technology and then built a large presence in global markets through heavy capital investment and capacity expansion.
Treating his own SpaceX as an exception, Musk also pointed out that China accounts for the majority of the total payload mass that launch providers other than SpaceX have carried to orbit.
Based on this manufacturing strength, he suggested that a similar change could occur in the memory industry.
In Musk's October 12 post, he said that until about three years ago DRAM was a low-margin commodity. He added that LPDDR5 and LPDDR6 are designed around common standards, and that China appears to be rapidly mastering their manufacturing.
Musk abbreviated these as "LP5" and "LP6" in the post, but in context they are thought to refer to the low-power DRAM standards LPDDR5 and LPDDR6.
LPDDR is memory that temporarily holds data being processed by a processor in devices such as smartphones and laptops. Its role differs from storage, which keeps photos, apps and other data over the long term.
Musk did not, however, assert that the RAM market would follow the same path as batteries and solar power.
In the actual post, he also said memory might be different.
He did not give specific forecasts or figures on how much Chinese production increases would push down global DRAM prices, or how much market share they would take from incumbent makers.
The remarks can be read as pointing out that the mass-production strength seen across Chinese manufacturing could also affect the memory market.
LPDDR6 is a common standard, but that doesn't guarantee the same performance in mass production
What caught Musk's attention was that LPDDR5 and LPDDR6 are designed around shared industry standards.
LPDDR6 is the next-generation low-power DRAM standard that JEDEC, the industry body that sets semiconductor standards, formally announced on July 9, 2025.
In the LPDDR6 standard "JESD209-6" published by JEDEC, the internal memory organization and communication scheme were revised to improve data transfer performance, power efficiency and reliability over previous generations.
One major change is a structure that transfers data across two sub-channels.
In LPDDR6, each memory die has two sub-channels, each assigned 12 data signal lines. This improves data transfer efficiency and flexibility.
The standard also introduces features that lower the supply voltage at low operating frequencies to reduce power consumption, as well as a power-saving mode that uses only one sub-channel when low bandwidth is sufficient.
On reliability and security, it includes "Per Row Activation Counting (PRAC)," which detects excessive access to memory cells, and "Memory Built-In Self-Test (MBIST)," a self-diagnostic function inside the memory.
With such specifications set as an industry standard, smartphone makers and SoC makers can evaluate products from multiple memory manufacturers against common technical requirements.
However, supporting a common standard does not mean every manufacturer can mass-produce products with the same performance and quality.
DRAM manufacturing demands advanced technology, including memory cell miniaturization, circuit design and process optimization.
In addition, "yield," which indicates how many good products come out of the mass-production process, greatly affects manufacturing cost and supply capacity.
Even among products supporting the same LPDDR6 standard, actual competitiveness can differ depending on manufacturing technology, yield, power consumption and the volume that can be reliably supplied.
What Musk suggested is that if Chinese companies overcome these manufacturing challenges, they may achieve large-scale production increases, as in earlier industries.
CXMT begins LPDDR6 mass production, adopted in the Xiaomi 18 Fold
A concrete example of China's memory industry moving into next-generation technology is CXMT's mass production of LPDDR6.
In an official announcement on September 7, 2026, CXMT said it had begun mass production of LPDDR6 and that it had been adopted in Xiaomi's foldable smartphone, the "Xiaomi 18 Fold."
This LPDDR6 product uses a 16Gb (gigabit) DRAM die and achieves a capacity of 16GB (gigabytes) for the whole package.
The difference between Gb and GB deserves attention here.
Gb denotes capacity in bits and GB denotes capacity in bytes, with one byte equal to 8 bits. A 16Gb die corresponds to 2GB of capacity, so multiple dies must be combined to form a 16GB memory package.
CXMT's product complies with the JEDEC LPDDR6 standard and uses an FBGA package with 1,295 solder balls.
Beyond supporting the new standard, getting it adopted in a commercial smartphone shows that the company's technology development has reached the commercialization stage.
Up to 12,800Mbps, but 10,667Mbps when connected to an SoC
One notable point about CXMT's LPDDR6 is the difference in transfer speeds.
The specifications the company published list two figures: 12,800Mbps and 10,667Mbps.
| Operating condition | Published data transfer rate |
|---|---|
| Maximum transfer rate of the LPDDR6 product | 12,800Mbps |
| Operating speed when paired with an SoC | 10,667Mbps |
The maximum transfer rate CXMT published, 12,800Mbps, is about 20% higher than the 10,667Mbps when paired with an SoC.
However, this compares transfer rates for the same memory product under different operating conditions.
An SoC (System on a Chip) is a single semiconductor that integrates functions such as the CPU, GPU and memory controller.
In a smartphone, LPDDR6 memory operates in coordination with the memory controller on the SoC side.
Therefore, even if the memory alone supports 12,800Mbps, that speed is not necessarily usable in an actual device.
In addition, the Mbps figure here is the transfer rate per data signal line. It does not directly represent the transfer bandwidth of the entire memory package or the processing speed of the whole smartphone.
For example, even if peak memory transfer speed is about 20% higher, app launches and gameplay do not become faster by the same proportion. Actual performance also depends on the SoC's processing power, the memory configuration, software and other factors.
CXMT further explains that, compared with its earlier LPDDR5X supporting 10,667Mbps, LPDDR6 delivers a 60% increase in bandwidth and a 20% reduction in power consumption.
However, these figures are based on CXMT's internal testing. The company also states that the bandwidth improvement is the result of comparing peak bandwidth.
The roughly 20% difference mentioned earlier compares the transfer rates of the same LPDDR6 product under different operating conditions.
The 60% figure, on the other hand, compares the peak bandwidth of LPDDR5X and LPDDR6, so the two are not the same metric.
They should therefore not be conflated to conclude that the real-world performance of an LPDDR6-equipped smartphone improves by 20% or by 60%.
HBM and 3D-stacked memory face even higher technical barriers
While praising China's progress on LPDDR5 and LPDDR6, Musk noted that difficult challenges remain in developing more complex memory technologies.
Specifically, he cited next-generation HBM, structures that place SRAM beneath logic chips, and structures that stack RAM three-dimensionally on top of logic chips.
When multiple chips are stacked vertically in particular, the heat generated by the compute circuits must be removed efficiently.
HBM (High Bandwidth Memory) is a memory technology that stacks multiple DRAM dies vertically to secure a wide data transfer path.
It is used mainly in AI accelerators and high-performance computing.
Compared with ordinary LPDDR, HBM requires stacking many chips and advanced packaging technology to connect them at high speed.
A concrete example is HBM4, which Samsung announced it had begun mass-producing and shipping to customers in February 2026.
According to Samsung's official announcement, its HBM4 uses an advanced DRAM manufacturing process, a logic base die built on a 4nm process, and DRAM stacking of up to 12 layers.
In HBM4, the number of signal lines used for data input and output has doubled from the previous 1,024 to 2,048.
This enables wide memory bandwidth, but it also makes power delivery, signal quality and heat dissipation more important.
Samsung explains that it improved power efficiency and thermal performance through measures such as lowering the voltage of TSVs (Through-Silicon Vias), the electrodes that run vertically through chips, and optimizing the power delivery network.
In other words, improving memory performance requires a design that covers not only DRAM cell manufacturing technology but also the stacking structure, connection technology, power delivery and cooling.
That said, LPDDR is not easy to manufacture either.
In CXMT's technical description of its LPDDR6, it introduces a function that adjusts transmit and receive characteristics for each pin to ensure signal quality during high-speed communication.
The company also explains that it uses a package with 1,295 solder balls and improved thermal characteristics through its choice of encapsulation material.
In other words, LPDDR6 also requires advanced circuit design and packaging technology.
Because HBM is also standardized by JEDEC, the difference between LPDDR and HBM cannot be simply divided into "standardized memory" and "proprietary-technology memory."
The two differ in chip placement, connection structure, required bandwidth, and power and thermal design conditions.
In addition, the structures Musk mentioned, with SRAM beneath logic chips or RAM stacked on top of logic chips, are not all the same technology as current HBM.
The remark reflects a view that realizing complex memory stacking technology involves technical challenges different from those of ordinary DRAM manufacturing. It does not assert that Chinese companies will be unable to achieve these in the future.
Chinese memory's competitiveness will hinge on production scale and expanding customers
CXMT's start of LPDDR6 mass production and its adoption in the Xiaomi 18 Fold show that Chinese memory has begun to be used in next-generation mobile devices.
However, it is too early to conclude on this alone that it has gained competitiveness on par with incumbents such as Samsung, SK hynix and Micron.
CXMT's official announcement gives no specific figures on LPDDR6 yield, monthly production volume or manufacturing cost.
Starting mass production is a different stage from being able to supply large volumes to smartphone makers worldwide.
When device makers adopt new memory, they need to check not only compliance with the JEDEC standard but also compatibility with their own SoCs, required capacity, transfer speed, power consumption and heat generation.
Being able to secure the necessary volumes reliably throughout a product's sales period is also important.
Even if a memory's performance is excellent, limited supply makes adoption in mass-produced smartphones difficult.
And even if the track record of adoption grows, that alone does not confirm profitability or cost competitiveness.
In judging the competitiveness of Chinese LPDDR6 going forward, the focus will be on how many device makers CXMT can expand supply to, and whether it can keep producing enough volume to meet that demand.
The strength of China's mass-production capability that Musk pointed to becomes a factor that changes the competitive structure of the memory market only once it reaches those stages.
If CXMT advances its LPDDR6 technology and expands its customers and supply volume, smartphone makers will have more sources for next-generation memory.
In advanced areas such as HBM and three-dimensionally stacked memory, on the other hand, challenges such as packaging and heat dissipation remain in addition to DRAM manufacturing technology.
How far China's memory industry can raise its competitiveness will have to be judged not only by peak transfer speeds and new product announcements, but by continuously checking actual adoption results and stable mass-production capability.