Effect of Non-Fourier Heat Transport on Temperature Distribution in High Bandwidth Memory

High bandwidth memory, as a key development trend in future memory chip technology, significantly enhances computer performance. At the same time, the thermal challenges arising from its stacked architecture have drawn considerable attention. Most existing studies on thermal management of high bandwidth memory are based on Fourier’s law, neglecting the non-Fourier effects introduced by the micro/nanoscale structures. In this study, the Monte Carlo method is employed to solve the phonon Boltzmann transport equation and investigate the impact of non-Fourier heat transport on the thermal behavior of high bandwidth memory structures. The results reveal that non-Fourier heat transport leads to a junction temperature that is 59.8 °C higher than that predicted by Fourier’s law. Furthermore, it is found that the phonon transmittance at the chip interlayers has a severe impact on heat dissipation, with the temperature variation reaching up to 56.6 °C. These findings provide more accurate thermal insights, which are critical for the optimized design of high bandwidth memory systems.