Qualcomm Snapdragon 810 is facing the overheating issue and for this reason Samsung is dropping to use this chipset on their most awaited handsets Galaxy S6 which is near to release and Galaxy Note 5 which is under development and Samsung will use their own designed Exynos system on chip in Note 5 instead of Snapdragon.
Previously Samsung devices had been equipped with Qualcomm Snapdragon 810 system on chip but now because of the overheating issue and making it more indigenous Samsung has decided to develop its own chipset which it has done with the name Exynos. Dropping the use of Qualcomm 810 is still a rumor but Samsung upcoming device Note 5 is likely to come with Exynos.
According to Samsung their own designed 14mm chipset is faster and more energy efficient in comparison with 20 mm Snapdragon 810 system on chip, therefore there are more chances of Exynos being used in their next devices. The leaked information also suggested that this particular change is made up with Galaxy S6 and in future forward towards Galaxy Note 5.
Previous rumored suggest that the Galaxy Note 5 would feature with 64 bit Qualcomm Snapdragon 810 chipset but now all the indicators point towards Exynos 7420 chipset which will paired with 4 GB RAM along with 256 GB built in memory.
Samsung in fact is heading towards complete self sufficiency in mobile devices. Galaxy Note 5 is still I rumors but in future users will get this powerful note from Samsung.
Source