Embodiments of the invention are directed to an integrated circuit (IC) package assembly, including: one or more printed circuit boards (PCBs); and a set of chip packages, each including: an overmold; and an IC chip, overmolded in the overmold, and wherein: the chip packages are stacked transversely to an average plane of each of the chip packages, thereby forming a stack wherein a main surface of one of the chip packages faces a main surface of another one of the chip packages; and each of the chip packages is laterally soldered to one or more of said one or more PCBs and arranged transversally to each of said one or more PCBs, whereby an average plane of each of said one or more PCBs extends transversely to the average plane of each of the chip packages of the stack. Further embodiments are directed to related devices and fabrication methods.