im thinking of buying Xiaomi mi 8 SE instead. need your thoughts

[Big Boar]

so im thinking of buying the mi 8 SE 4gb variant to save some money, but first i have some questions.

what are the benefits of 6gb Ram variant over 4gb? i read its to keep several apps on the background running, but i don't open more than 4 apps, i think i just need one game that keeps running on the background. so.. is 4 ram more than enough for me? or does 6 ram improve something like gaming performance? i actually looking for a phone that can run the new heavy game: black desert mobile and i need it to keep running on background while i browse on youtube

second: is the snapdragon 710 can run heavy games like black desert mobile on max graphics settings without heating problems, lags, and framedrops? do you advice to max the graphics settings, does it drain lots of battery on max settings or only a bit?

and finally how big the gap between SD 710 and 845? i only need a phone that can perform very smoothly on heavy graphical games like black desert. is the SD 710 enough? is there big difference in performance? thank you for helping me decide which one to buy!