How do I contact XMR-Stak dev to request an API? There is web interface but won't be integrated into Awesome Miner with no API.

HBCC is set manually and you do it in general radeon settings - Global settings.  Not wattman.

Not sure if I understood your question correctly or not.    Apparently HBCC has to be toggled every reboot as its not showing on or off correctly?
This part on startup might give the clue though
What is the power watt usage for the card when set to the 43mh method.    When I move wattman settings from default with target temperature from 75 down to 69 I gain 12% in MH hash, just something worth mentioning.   AMD is not the type of card to work optimally by itself.

Just toggling HBCC while I write/read this thread(it was already showing as on in radeon panel),  I got an extra 4%  hash so worth doing.  I havent tried varying amounts applied.

Does anyone find NiceHash useful at all for management

1100 mem clock can be to much for Vega56

with the registry mod, I managed to run 5 of the 6 cards. Currently using 1200W.

The 6th one crashes tho, so I have disconnected it. Any tips how to uninstall the driver on it?
Its the 0006 in the registry.

Guess some other tweaks have to be done on it, as the windows crashes on start after the mod is applied.

Pff. Another (that I was having problems with before) didn't want to run stable.
Fixed it for now with a bit of manual undervoltage to 1050. The other one that was not accepting the mod - I've put it some random values - 1100 1025 with -10 power. And its hashing at 40. But the last 2-3 leds are blinking ... Needs the full power I guess?

All stable for 20 mins now, 260 MHs ETH, ~1450W from the wall. Hopefully that will last until I wake up.
Noticed huge difference between claymore 9.8 and 10.0 - with 17.8.2 the 9.8 was giving me slightly better hashrate, now its reversed, but the difference is around 2 MHs per card.
Also the hashrate seems to be incredibly stable, values for each card rarely change, what was not the case with 17.8.2.

 
A big thanks to OLDcomer's Hardware!

possible tell me setting for this??

I wouldn't go with 6 Vega now, to many problems can be. 4 Vega+something else (Nvidia for example) should be fine

If they are the same price, buy the 64.

If you want to mine the Monero, you can buy a good CPU.

Meanwhile my rig with 3 Vegas 64 is running without dropdowns xmr @1900-1950 h/s per card.
1418Mhz@925mV (rednow-mod)
And blockchain drivers


For unstable hashrate, dropdowns:
Put the W10 energy management to High Performance,
Disable "Turn off monitor after 15min" -> leave Monitor allways on.
Monitoring Tools like Z-GPU are causing dropdowns as well.
Remote Desktop Connection is crapp as well...
Further on I applied a registry tweak from for mining which I found somewhere in www