Well... as expected.
20 minutes in with these settings:
-tt 58 -cvddc 750 -cclock 1300 -fanmin 0 -mclock 904 and I get this:
WATCHDOG: GPU 0 hangs in OpenCL call, exit
WATCHDOG: GPU 0 hangs in OpenCL call, exit
Quit, please wait...
then the computer freezes and I have to reset it. Going to dial back to -mclock 900 and let it sit for a few hours.
EDIT:
51 minutes in and still holding but doesn't seem stable.
58C / 57C / 56C giving ~50.5MH/s each but it's bouncing between ~45MH/s to ~50.5MH/s at times.
DDU, fresh install of the drivers (19.9.1, I had issues with .2) - just install drivers from Device Manager.
Set all clocks/power in miner as you've been trying.
My card is Saphire (without PULSE) Radeon RX 5700xt. Maybe I had luck with the vendor and the model. Running already 22 hours with stable hashrate (no bouncing), no crashes, mem temp 76 degree C, power draw reported 94W, fans about 44%, room temperature 22 degree C. Using PM with -tt 58 -cclock 1300 -mclock 910 -cvddc 750