A semiconductive device stack, includes a baseband processor die with an active surface and a backside surface, and a recess in the backside surface. A recess-seated device is disposed in the recess, and a through-silicon via in the baseband processor die couples the baseband processor die at the active surface to the recess-seated die at the recess. A processor die is disposed on the baseband processor die backside surface, and a memory die is disposed on the processor die. The several dice are coupled by through-silicon via groups.