I would run your 2nd and 3rd cards from risers from the pcie x1 slots.
But, you could also try slowing down the pcie to free up more lanes. From the manual for your mobo you can change the generat… (View Post)
I just installed 17.10.3 on Windows and my rate improved to 43.5 Mh/s from 37 on 17.10.1. This is for a Vega 56 flashed to a Vega 64.
With the following settings in Claymore:
-cclock … (View Post)
I am in a similar boat with Z170, but I have had success getting up to 5 GPUs, so I thought I would share what worked for me.
ASRock Z170 Overclock Formula with BIOS v2.4
5x AM… (View Post)