A semiconductor package comprises a substrate, a first semiconductor die mounted to the substrate, and a first double side mold (DSM) internal stackable module (ISM) bonded directly to the first semiconductor die through a first adhesive. The first DSM ISM includes a first molding compound, and a second semiconductor die disposed in the first molding compound. The semiconductor package further comprises a first electrical connection coupled between the first semiconductor die and the substrate, and a second electrical connection coupled between the first DSM ISM and the substrate.