The upcoming Meizu Pro 7 will have a second, color display on the back as one of its key selling points. We always hoped that we would be able to use it for taking selfies with the primary camera, but now we have actual confirmation of that functionality.
The interesting feature allows you to use both the front and back cameras to take a selfie - yay!
Meizu is expected to unveil the Pro 7 and maybe a Pro 7 Plus in China at the end of the month. The Pro 7 will have a 5.2" 1080p display on the front and a 2.0" secondary screen on the back. It should be powered by MediaTek's Helio X30 chipset with deca-core CPU, which is based on a 10nm process and should be a proper powerhouse.
More since on idle maybe only 2-4 low power cores are active while others are totally sleeping. Can't have such saving on single powerful core even with highly dynamic frequency scaling.
Battery saving and performance. 10 cores running at 1ghz use less battery than 1 core running at 10ghz read it at android authority