The processor embedded in the Galaxy Alpha is the first to benefit from an engraving in 20nm HKMG instead of 28nm HKMG of previous generations.
The Galaxy Alpha comes in a metal shell along with 4G LTE-A at 300 Mbps but it also benefits from a next-generation family in the Exynos 5 Octa-Core processor of Samsung. The SoC Exynos 5430 integrates a 32-bit CPU with 4 cores octa-core ARM Cortex-A15 and 4 cores ARM Cortex-A7 which has the distinction of being the first to be engraved in 20nm HKMG (High-K Metal Gate).
The qualities of the Korean group founder allows it to spend 28 nm HKMG process to each 20 nm which reduces energy consumption by 25%. The SoC architecture meets a big.LITTLE HMP (Heterogeneous Multi Processing), which enables separate cores within each cluster.
Samsung claims management resolutions up to qHD (2560 x 1440 pixels) and extended QHD (2560 x 1600 pixels) and uses an ARM Cortex-A5 coprocessor for audio decoding. For the graphics, it's an ARM Mali T628MP6 GPU that is present.
With this announcement, we can expect that the SoC Exynos to be present in the future phablet of Galaxy Note 4 expected in early September which might be also engraved in 20nm HKMG.