@rednoW

Thanks for the info , didnt really help though.

1. Set you Virtual memory size to 64gb ... >>> done
2. Use blockchain 23Aug drivers...  >>>yep
3. Move HBCC slider to some new position or just switch it off / on depending on your current setting. Hit apply >>> All @ 170040mb
4. Set your HBM2 mem speed to 1100 ?!??!?!?

Its a vega 56 not 64 as i understand 56 has lower clocks (but better timings ? @ 920).... anything over 950 result in a crash
920 seems stable, 950 stability depends on STAK settings

5. Run xmr-stak-amd with 2 threads and intensities 2016 and 1800. Maybe decrease intensity for monitor attached card.

2016 / 1600 works ... 1800 crashes...  had it upto 800 once now it's between 600 and 700 no matter what i try it wont go higher

6. (optional) Apply reg patch if you want to lower power consumption. For monitor attached card you will need much higher voltage.
Is the reg patch also working for vega56 (thought is is for 64) but first need to try to get things stable i guess...

P.S. Don't use GPU-Z. For monitoring use latest HWINFO64 with GPU I2C support disabled in settings >>> ok , thanks Both seem to work though