So now I have tried something again, I have taken over the PowerTableSettings of LIVADA, so it definitely reduces the power consumption significantly. I changed it a bit, too.
I will definitely continue to work with SRB Miner and will continue to test the setup with my Vega64 rig.
Here are my values and settings:
SRB Miner 1.9.3. Windows 10 (1803) Adrenaline Driver 18.6.1 ASUS B250 Mining Expert 8x Vega64 - WATER cooled // 4x Vega64 FE 2x ENERMAX - Platimax 1700watts
For algorithm: MONERO/XMR - V4R
The achieved values are currently between: 2300 - 2350 H/s per card @tweak-profile "10"
Total power consumption at: ~ 2410 watts (/ 12 = 200.83 watts per card) The system runs completely stable, the FE graphics card crashed at 1450Mhz / 866mV - with TWEAK profile "10" So I reduced my FE cards to 1408Mhz / 866mV and is now stable. The water-cooled cards are stable at 1450Mhz / 866mV
I have already written a post where the cards to ~2450 H/s create, but was not paid attention to the power consumption! I've been trying to achieve maximum performance here.