I spend roughly 2 days now trying to get 8x rx580 running with rxoc. I have another rig with 8x 1060 and nvoc running. Hardware i use:
Asus prime z270a
Hp dps1200 with breakout board
160w pico psu
8gb ddr4 ram hynix
Celeron 3900
When i use 1-2 cards in the main 16x pcie slots they boot fine. But a 3rd sometimes doesnt come up (using the 3rd big pcie slot) and on 4th card sometimes screen freezes up on boot or i get strange pcie error output in terminal (using the 1x speed slot on the top / nearest to cpu)
Bios settings i did the same as the other rig i am using sith same asus board. On this video you can see wich settings:
https://www.google.de/url?sa=t&source=web&rct=j&url=%23&ved=0ahUKEwi6oY6Er9XYAhVOZVAKHadWCukQwqsBCB8wAA&usg=AOvVaw0VTJzWxrN8ZFOD4xbU2novDouble checked the settings. I switched mainboard, psu, riser, usb cables, cards, hdd. I tried every card on its own as single card setup, they all boot up fine.
With one power cable 6pin pcie i power riser 6pin pcie and psu 8pin pcie by y-cable. I get power for the ssd from the pico psu wich gets power from an own pcie port of the dps1200.
The cards have a bios switch. I tried both modes without success.
I really hope someone has an idea because i am lost.
BR