When MediaTek introduced the world's first true octa-core chip in July, that put pressure on Korean OEM Samsung; after all, the Samsung Exynos 5 Octa can only use one set of four cores at a time while the MT8135 can use all eight cores at a time. But thanks to Samsung's Heterogeneous Multi-Processing solution, the Samsung chip will also be able to use all eight cores at once, starting in the fourth quarter...
Source: http://www.phonearena.com/news/Samsung-Exynos-5-Octa-CPU-to-have-use-of-all-8-cores-at-one-time-starting-in-Q4_id47266
Source: http://www.phonearena.com/news/Samsung-Exynos-5-Octa-CPU-to-have-use-of-all-8-cores-at-one-time-starting-in-Q4_id47266