Are you also getting poor performance, with the CPU also not having any cores near 100% in combat?
i don't really get 100 % at single core but zen 2 are not easy to read...
i don't even understand what a performance GPU should be doing in this game.
this is not a judgement of the quality of the game.
darkest dungeon looks amazing great too but you clearly don't need a powerful GPU for this.
an intel iGPU can run this game fine and it is magnitudes slower then even an older RX 580.
i still have a couple of nvidia card laying around here i could test too. why should i my 5700 is taking a nap.
i can't recommend the NAVI series anyway. keep your finger of it if you like having a working PC. this will change with time but they are not there yet.
the current driver reports hardware decoding as hardware encoding...