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12 RX570 wont work, but 4 works well

Asrock h110 pro btc updated bios
12x powercolor axrx570 8gb micron 4 cards with OEM bios and 8 with custom (works well on win8 for month)
3x kcas 850w gold, connect with 5w relay 1+2
Connecting 1power with 4 cards, 14+14+1*4=3 power and 12 cards.
When i start rig with 4 cards and 1 power, it starts well, all cards ON and works fine. 8 cards with 2 power works fine. When i start 3 power with 12 cards, in bios i see all cards, and when rig load, i see all cards but its off. Cant find the reason by myself for 3 days, please help.

Ethminer on screenshot its when i try diffrent types of miners.
Working on nanopool and claymore, ETH