 Assuming that the die can physically fit into the package, multi-core CPU designs require much less printed circuit board (PCB) space than do multi-chip SMP designs.Also, a dual-core processor uses slightly less power than two coupled single-core processors, principally because of the decreased power required to drive signals external to the chip.Furthermore, the cores share some circuitry, like the L2 cache and the interface to the front-side bus (FSB).