my results
I see you undervolt core to 680mv. The lowest I can uv in windows 10 with my MSI 5600xt MECH is 800mv. Did you flash your bios with lower voltage limit? Or is it stock?
Very strange, the lowest Windows allows me to undervolt is to 800mv, but I can get 700mv in Hive OS. This is all with stock bios as 5600xt bios cannot be modded, you can try it and in windows you get an error and you also get an error in hive OS (5700xt easy to bios mod)
Maybe that program Wattman bypasses the 800mv windows limit somehow, I might try that