China’s DRAM champion ChangXin Memory Technologies (CXMT) has started risk production of HBM3E memory, The Information reports. Although CXMT remains a generation behind the big three memory manufacturers, which are mass producing HBM4, it goes without saying that reaching the HBM3E milestone highlights the company’s rapid technological progress.
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Specifications of CXMT’s HBM3E products are unknown, though keeping in mind that we are dealing with risk production, specifications of actual HBM3E products from CXMT may differ from risk production samples. Meanwhile, general JEDEC specifications are well known: HBM3E modules feature a 1,024-bit-wide memory interface, supports data transfer rates up to 9.6 GT/s per pin, and can stack 8 or 12 memory devices. Depending on the exact speed bins, HBM3E can provide up to 1.228 TB/s of memory bandwidth.
Capacity of actual memory stacks depends on the number of DRAM dies used in that stack: HBM3E products can offer 24GB of capacity using an eight-die stack or 36GB using a 12-die stack when built with 24Gb DRAM devices.
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Several Chinese developers of advanced processors are already evaluating CXMT’s HBM3E with their processors, including Alibaba Group’s T-Head and Cambricon Technologies, according to the report. If testing and qualification proceed as planned, these companies could begin using CXMT’s HBM3E in commercial products as early as next year.
Since every HBM package requires multiple large DRAM dies, growing HBM output could consume considerable DRAM manufacturing capacity, which is when CXMT’s aggressive capacity expansion will be useful.
CXMT’s manufacturing of HBM3E is important for multiple reasons and arguably the HBM3E generation itself matters less than CXMT’s ability to manufacture usable HBM at all.
Firstly, HBM is one of the critical components of modern AI accelerators, so if CXMT’s HBM3E qualifies with processors from Cambricon, T-Head, and other Chinese designers, China becomes less dependent on Micron, Samsung, and SK hynix for building high-performance AI hardware.
Secondly, despite being a generation behind HBM4, HBM3E is still very capable memory and can provide several TB/s of bandwidth, sufficient for powerful AI accelerators. In fact, many Chinese developers of AI accelerators do not necessarily need HBM4/HBM4E to build useful AI systems.
Thirdly, HBM is substantially harder than making ordinary DRAM. CXMT needs not only competitive DRAM dies, but also high-yield stacking, through silicon vias (TSVs), very fine interconnects, thermal management, packaging, and testing. Reaching HBM3E risk production proves that China’s memory ecosystem is advancing beyond simply manufacturing commodity DRAM.
Finally, there is also an important geopolitical angle. Export restrictions constrain China’s access to advanced AI processors and HBM, so a combination of Chinese-designed accelerators, CXMT HBM3E, and advanced domestic packaging indicates that China becomes one step closer to semiconductor self-sufficiency.
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