Semiconductor research institute imec simulated vertically oriented memory dies above GPUs, with cooling cavities between dies.

The work evaluates a three-dimensional memory-integration architecture through thermal simulation. Researchers rotate dynamic random-access memory (DRAM) dies vertically above a GPU and place cooling cavities between them. The source describes simulation research, not a commercial package or production deployment.

The study compares this arrangement with conventional high-bandwidth memory (HBM) integration approaches. Specifically, the summary identifies conventional 2.5D HBM and directly stacked HBM-on-GPU as alternatives against which the architecture is considered. The distinguishing feature is the orientation of the memory dies and the intervening cooling cavities.

Package-level simulations examined stack height, memory capacity, and memory organization. The paper is titled “Beyond HBM-on-GPU: Thermal Design Envelope for 3D Volumetric DRAM-on-GPU Integration.” The supplied excerpt does not report numerical temperature reductions, capacity gains, bandwidth improvements, or fabrication results.