Samsung's Exynos 5 Octa, the chip which powers the international version of the Galaxy S 4 and a few other upcoming Samsung products, has eight ARM CPU cores. Four of these are based on the high-end Cortex A15 architecture and are used for more intensive tasks, while the other four are based on the slower but more power-efficient Cortex A7 architecture. These cores work together using an ARM-developed feature called big.LITTLE.