Can feel difference ah 650 and 625? Anyone use both before? Gaming should be slower i guess but battery should be good.

If she don't multitask won't have problem but this model still got 2gb meh. I suggest you get her sd version if money no object, 10 hour sot she will definitely appreciate.

It's about throttling, if your phone heats up, it will have to drop clockspeed to compensate, it also affects battery life when the phone is too hot. If you read the preview they also mention they can't feel much diff in terms of performance for real life usage.

I don't think so little, sd easily 10hours sot if you don' play games. Just read through this thread, sd battery life page 2.
https://forum.xda-developers.com/redmi-note...ussion-t3487407

But just get what your budget allows lah, either will feel amazing if you upgrade from 2-3 year old phone All I can tell you is redmi note 3 will get very hot playing 3d games(just normal 3d game, like that koi game will also heat after few minutes), battery life get affected badly from that, that's from my own experience. You can extrapolate how these chips will perform.

Try developer options>turn off miui optimizations, see got improvement?