Try doing it manually, also post your gpu-z screen with your bios version. You may want to update if its outdated. I'd try setting it to 990mV @ 1800MHz first, see if that runs. If stable try 980mV @ 1800MHz, and so on, until you find the spot it crashes. You can adjust fan to your preferences, and possibly get better clocks and/or lower temps or vice versa. I recommend running heaven in window and looking for artifacts. If you see artifacts, stop heaven, and change your settings. You can use my stress/undervolt/overclock testing if you wish as template. (as its unmodified radeon vii stock air cooling) or you can use this community table, tho cooling is not listed on all of them, and you can't be sure its not just 1min undervolt/overclock for one case. //Note: On my XFX radeon vii i can reach 2GHz on core, on air. I am thermally limited, and i feel there's a lot of potential once i'm not.