SK Hynix moves cooling directly to D2D PHY to tackle rising HBM heat challenges - digitimes

SK Hynix addresses critical thermal management challenges in HBM technology as AI data processing demands surge, with higher stacking and faster speeds increasing power density. By integrating cooling... Read original →

SK Hynix’s integration of active cooling into the D2D PHY interface between HBM and GPU marks a paradigm shift: thermal management is no longer an afterthought but a foundational element of chip architecture. This move forces upstream TSV processes, interposer materials, and test equipment to evolve rapidly—favoring OSATs with CoWoS or Foveros expertise. Amid tightening U.S.-EU export controls on AI accelerators, such thermal innovations risk being classified under high-performance computing restrictions, complicating access for non-U.S. allies. Samsung and Micron will likely fast-track liquid-cooled HBM4 designs, while NVIDIA may push standardized thermal interfaces to consolidate supply chain control. Within 18 months, co-thermal design between memory and compute will become a decisive factor in AI chip procurement, compelling foundries like TSMC and Intel to embed thermal-aware simulation directly into PDK flows—where power density, not transistor count, defines the new scaling frontier.