The helio X20 has two Cortex A72 at 2.5GHz, four A53 at 2GHz in a middle cluster and four ARM A53 in a low power cluster clocked at 1.4GHz. Which is all pretty good.
But the X30 has four Cortex A72 cores at 2.5GHz, two A72 clocked at 2GHz, two Cortex A53 clocked at 1.5GHz and two low power A53 at 1GHz. This means that X30 will gain significant performance over X20 and give MediaTek a huge advantage in the fight against Qualcomm and Samsung.
The new core ships with ARM Mali T880 graphics and supports up to 4GB RAM and eMMC 5.1 class storage. The X30 supports dual channel LPDDR4 1600MHz memory.
The other SoC Helio X22 has the same cores as the Helio X20 just faster clocked. Sadly details are sketchy.
For those who came in late, the Helio X20 a first 20nm deca-core chip has two A72 clocked at 2.5GHz, four A53 clocked at 2GHz and four A53 ultra low-power cores clocked at 1.4GHz.
Alll three chips including X30, X22 and X20 will appear in phones in early 2016 and we should see samples before the end of the year.