A good news for you if you are planning to buy Galaxy note 4, According to latest report Samsung's flagship Galaxy Note 4 Exynos 5433 chipset is the 64 bit chipset, that's why Note 4 becomes the first Android flagship Smartphone to feature 64 bit chip. Ahead of Note 4 release, everyone was expecting Exynos 5433 will be featuring Cortex A15/A7 configuration, but now latest news is telling something pretty amazing for Note 4 buyers because Exynos 5433 is featuring A57/A53 design which ARM is capable of nearly 64 bit system.
Though, Samsung didn't made official announcement regarding Exynos 5433 processor power, They stated simply 1.9 GHz Octa core processor but on paper because of this chipset Note 4 becomes the first Android device to cross over the 64 bit fence. Now that was the reason why Galaxy Note 4 was on top of benchmark test because of busting performance of its Exynos 5433.
One would surely ask, why Samsung didn't advertise this feature of its Exynos 5433. Well, answer lies in a fact that Note 4 is currently running in 32 bit mode because Android KitKat didn't support 64 bit architecture. I am sure Samsung most probably will advertise the fact once Android L will be official. Once Galaxy Note 4 will ve having Android L as OS, it will change its mode from 32 to 64 bit.