1. Update BIOS to the latest version (or at least 06XX)
2. Disable PCIex power management
3. Set to Gen2 everywhere you find it (4 places)
4. Disable HD audio, serial port
5. Set primary display as PCIE
6. Set M.2 as PCIE
7. Enable Above 4G decoding
Thank you for the input.
1. Ok, BIOS was already at 8010
2. Never found an option to do it, only CPU Power Management
3. Only had 3 places (I have only 1 item under PEG Port Configuration)
4. Ok
5. Ok
6. Ok
7. Ok
After doing this, I was managed to run 450 Sol/W on both GPUs using DSTM's ZCash Miner. So, mission complete so far.
Still lots, to learn.