Will developing CXL in-house jeopardize their own DRAM business? Samsung, SK Hynix, and Micron simultaneously abandon in-house development of CXL controllers.
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The world's three major memory chip manufacturers have completely halted their independent research and development plans for CXL (Compute Express Link) controllers, turning instead to products from specialized chip design companies. This collective shift reflects the core contradiction in the memory industry: aggressively promoting self-developed chips could erode their most important source of income—the general DRAM module market.
On July 20, according to Korean tech media ZDNet Korea, Samsung Electronics, SK Hynix, and Micron Technology have all scaled back or abandoned commercialization plans for CXL expansion device controllers. Montage Technology, Astera Labs, and PrimeMass, specialized chip design companies, are filling this gap.
This change means that the division of labor structure in the CXL ecosystem is being reshaped, with memory manufacturers focusing on production while design leadership shifts to independent chip design companies.
For the capital market, this not only benefits relevant chip design companies, but also means that in the short term the three major memory manufacturers will not launch new competition around full CXL solutions, with their core profit models still centered on traditional DIMM memory products.
The Three Major Manufacturers Adjust Strategies One After Another
The pace at which the three companies exited self-developed controller projects is not the same.
Micron acted most decisively. According to reports, the company has closed its CXL controller R&D department and adopted PrimeMass's controller solution, with relevant products already included in Micron's product catalog.
SK Hynix has officially notified partners of the termination of its self-developed controller project, redeploying its R&D team to PIM (Processing In Memory) business, showing its intention to focus resources on next-generation memory architecture with stronger long-term competitiveness.
Samsung’s adjustment is relatively cautious. According to semiconductor industry insiders, Samsung has removed the self-developed CXL controller from its official commercialization roadmap, retaining only advanced research projects. The team is currently mainly researching areas such as combining LPDDR with CXL.
Meanwhile, Samsung has turned to external sourcing of controller products. This means the previously planned "self-developed controller + CXL Memory Module (CMM)" integrated product has effectively been put on hold.
Why Has Independent Controller Development Lost Its Appeal?
The three major memory manufacturers originally had highly consistent ideas: package the controller and DRAM on the same circuit board, sell a complete solution, and obtain higher product added value.
But the market ultimately chose another path. Data center customers prefer modular architectures, with controllers deployed independently on the motherboard, paired with standardized, low-cost DIMM memory modules. This solution reduces procurement costs and retains flexibility for later upgrades and supply chain options.
The change in customer demand has put memory manufacturers in a dilemma. If they insist on promoting integrated products, they must not only bear the R&D cost of controllers, but higher prices may also affect market acceptance. More importantly, if customers reduce standard DIMM purchases, it would impact the manufacturers’ most core source of income.
According to a semiconductor industry insider: If a complete CXL product has to directly compete with the company's DIMM business, the significance of promoting controller commercialization would greatly decrease. With the risk of eroding the core business, it is difficult for management to continue investing resources.
In other words, rather than cultivating a new market that might weaken the DRAM business, it's better to leave controller design to specialized companies and continue focusing on memory manufacturing, which has the greatest scale advantage.
The CXL Ecosystem Enters A Stage of Specialized Division of Labor
Industry insiders believe the three major manufacturers’ exit from self-developed controllers does not mean abandoning CXL.
On the contrary, this is more like a typical division of labor as the industry matures. Controller design is handed over to fabless chip design companies, memory manufacturers continue to leverage their manufacturing and DRAM technology advantages, each creating value in their most competitive sectors.
With this trend established, Astera Labs, Montage Technology, and PrimeMass are expected to further consolidate their position in the CXL controller market, while Samsung, SK Hynix, and Micron can focus their R&D resources on advanced DRAM technology, HBM, and PIM, which offer greater long-term value.
From the perspective of the industrial chain, the logic of CXL development has not changed—what has changed are the roles of the participants. Memory manufacturers no longer attempt to build complete platforms, but return to supply chain division of labor, meaning the CXL ecosystem is moving from early exploration to a more mature stage of commercialization.
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