SK hynix has begun recruiting for a new specialty, 3D-stacked DRAM, and says it already has a US customer lined up to co-develop it with, semiconductor analyst Jukan reports. According to a job posting spotted by industry sources, SK hynix's US subsidiary in San Jose is hiring engineers to design DRAM chips stacked directly on top of a logic chip rather than placed beside it, a first for the company. The pitch: shorter distance between memory and logic means more data channels in the same footprint, lower latency, and better power efficiency than today's package-on-package designs, which SK hynix argues can't keep up with on-device AI's demands. On-device AI runs AI models directly on a phone or other gadget rather than in the cloud, and Apple and Qualcomm are the two biggest names in the mobile processors this would need to pair with. SK hynix's chief development officer said in April the company wants to go beyond HBM, the memory that feeds Nvidia's AI chips, and offer high-bandwidth flash and 3D-stacked DRAM-on-logic for a wider range of AI workloads. Jukan's own guess for the mystery US partner is Apple, though that isn't confirmed, and he notes the industry still needs breakthroughs like this before on-device AI becomes mainstream, since cramming enough memory into a phone otherwise isn't realistic.
Why it matters · If SK hynix's bet on 3D-stacked memory pays off, it extends the company's AI memory dominance beyond HBM and Nvidia's data centers into phones and edge devices, a much bigger addressable market, and a confirmed US partner even before the technology ships would be a strong signal about who's serious about on-device AI hardware.
Worth asking · SK hynix hasn't named its US partner, and Jukan's guess of Apple is unconfirmed. If it turns out to be Apple, would that meaningfully change how investors value SK hynix's non-HBM business, or is this still too early-stage to matter to the stock?