The Redmi Note 4 was launched with MIUI 8 skinned Android 6.0 Marshmallow OS. The Redmi 5 Plus, Redmi 6 pro and Redmi Y2 and the older Redmi Note 4 are all powered by Snapdragon 625 chipset.

According to the leaked images, the Note 4X device will run on Android 6.0.1 Marshmallow along with MIUI 8.1 on top. In specifications, the phone will feature a 4GB RAM and internal memory of 64GB.

Redmi 4 prime they are almost the same except in size (5inch vs 5.5inch), better go with the Redmi note 4X since the buttons on the redmi 4 prime arent backlight, ...

The Redmi Note 5 was able to handle almost everything I threw at it. There was no lag switching between apps and while multi-tabbed browsing – granted I was on the top end variant with 4GB of RAM.