A semiconductor package includes a redistribution structure, a memory wafer, semiconductor dies and conductive vias. The memory wafer, disposed over the redistribution structure, includes at least one memory die. The semiconductor dies are disposed side by side with respect to each other, between the memory wafer and the redistribution structure, and are electrically connected to the redistribution structure. The conductive vias electrically connect the at least one memory die with the redistribution structure. A semiconductor package includes a redistribution structure, a reconstructed wafer, and a heat sink. The reconstructed wafer is disposed on the redistribution structure. The reconstructed wafer includes logic dies and memory dies. The logic dies are electrically connected to the redistribution structure. The memory dies are electrically connected to the redistribution structure and vertically stacked with the logic dies. The heat sink is disposed on the reconstructed wafer. The heat sink is fastened to the reconstructed wafer.