MTK6799 Helio X30 is the follow up successor to MediaTek / MTK’s current flagship SoCs Helio X20 MTK6797 and Helio X25 MTK6797T.
MT6799 10nm process

The big news about Helio X30 is that it features CPU cores utilizing 10nm FinFET process. This chip design was joint developed by ARM and TSMC over several years.
MT6799 Helio X30 CPUs

The CPUs in Helio X30, as with Helio X25 will work in a big.LITTLE configuration. In a big.LITTLE setup, the most powerful cores will handle very CPU intensive tasks, the mid-powered cores will handle medium load tests, and the lower-powered cores will handle light load background tasks.
source http://www.phonecorridor.com/2016/10/mtk6799-helio-x30-flagship-soc-from-mediatek-announced/