And how much temp are you getting under those hours of gaming with undervolt? Also which preset (nom_l1 etc) and what Mhz, thanks!
It depends, but normally I shut off the thermal engine on my phone with root, When I play genshin impact. The CPU temps are between 75-80 degrees and the GPU temp is between 70-75 after heavy gaming. ( I am playing with Blackshark Funcooler 3)
CPU Temps can momentarily spike up to 85-87 degrees in fights on various lands.
the reason why these temperatures are so high may be because I have removed the SoC temperature limit. With SoC thermal limiting on, I don't think it will exceed 70 degrees, but with thermal limiting on, you may experience sudden FPS drops in the game, both as you play the game and in mob battles.
I suggest you install Game booster plus and turn on framebooster in the setting for Genshin Impact, I also play with GPU fixed to 730mhz (can be done from Thundertweaks app)
The reason I fixed the gpu to 730mhz is because it reduces sudden FPS drops in the game.
In general, FPS drops occur because the framebuffer codes in the game are not coded correctly. I hope the game will fix these bugs in the future.