Where is the HBM controller in this design? Stacked in a middle layer or integrated into the main GPU die?

>"According to the company [Samsung],

zHBM can deliver up to eight times the data-processing performance of eighth-generation High Bandwidth Memory (HBM5) while improving performance per watt by a factor of three.

Thermal resistance is reduced by more than half, enhancing both system stability and energy efficiency."

if all thats true, this is some impressive specs.