A semiconductor package assembly having a first semiconductor package, with a first redistribution layer (RDL) structure, a first semiconductor die having through silicon via (TSV) interconnects formed passing therethrough coupled to the first RDL structure, and a second semiconductor package stacked on the first semiconductor package with a second redistribution layer (RDL) structure. The assembly further includes a second semiconductor die without through silicon via (TSV) interconnects formed passing therethrough, coupled to the second RDL structure, and a third semiconductor package stacked on the second semiconductor package, having a third redistribution layer (RDL) structure, a third semiconductor die without through silicon via (TSV) interconnects formed passing therethrough coupled to the third RDL structure. the third semiconductor package is coupled to the second RDL structure by second vias passing through a second molding compound between the third semiconductor package and the second RDL structure.