Has someone succesfully tried to get 2x vegas 56, 2x vegas 64 working together with 2x rx570 + 2x rx580 on the same rig for mining XMR?
I am able to use the xmr-stak-amd miner and recognize all 8 GPUs. But when I try to use Hellms tweak of double threading the vegas (page 26), the Hash doesnt go up and Im stuck at ~ 750 H/s fo revery card, regardless of vega or rx580/570 and also without any effect on the intensities i put (2016/1600, 1000 or any combination).
I have blockchain drivers and win 10.
Thank you guys!
Hellms Hellae's tweak ... FTFY

Hellms tweak is the soft power tables on Regedit, a complete different thing.
About 2xV56 + 2xV64, I saw someone on reddit at /r/moneromining able to run them.
This is not an answer to your question, but more an advise to when you finally manage to have all cards working:
Do not run Vega's and 500s on the same stak instance. The variable difficulty of the pool will be increased by a lot with the Vega's and the 500s will strugle to submit valid, non expired shares.