Hi, you can use SRBminer: https://bitcointalk.org/index.php?topic=3167363.0

Low fee, great speed, 950h on my RX580s and supports v8 fork.

Tried 11.2 miner. Worked well for few hours with little more hashrate but after that - constant crashing and after crash I cannot even start it again. Back using 11.1 version.

Finally found solution. I unplugged one rx570 and left two remaining rx580 connected. After windows booted up I uninstalled(deleted)  drivers for 2 rx580 through device manager not DDU. Then powered off pc, plugged 2 rx570 and powered up. All card showed in device manager as basic display adapters, installed blockchain drivers and ati patcher. After that I rebooted pc and mining is on ⚒ 
Best regards.

Hi,
the PSU is new EVGA SuperNOVA 850 G2. I tried to isolate the riser but they all working when 3 GPUs are connected. I tried connecting GPUs one by one (starting from slot pciex16_1) and windows detects and installs drivers without problem. But when I connect 4th card into pciex1_3 slot, windows boots up not showing that GPU(fan is spinning like on other 3).
Thanks.

Hi,
OS is recognizing only 3 of GPUs, there is no 4th in device manager at all(like as unknown or device with problem).
My MoBo bios version is 2205 as on Asus support page. Is there something in bios settings that I'm missing, some particular settings to apply?
Thanks.

Hi,
I tried several risers but still the same. This happens only on 4th GPU connected to pciex1_3 slot and what is interesting that if there's a 3 GPUs, no matter in which slot I connect them, they work.
Thanks.

Hi,
I have a rig with 3 GPUs:
2xAsus Dual RX580(with modded bios)
1xSapphire Pulse RX570(no bios modification)
Motherboard: Asus H81m-pro with 4GB of RAM.
I'm trying to add one more GPU(Sapphire RX570) but with no luck. I checked all of the risers-OK, all of GPUs are working since I tried them one by one. My OS is Win10 and I'm using latest blockchain drivers from AMD. So, I tried DDU and clean install but no change, 4th GPU isn't showing up in device manager. Sometimes fans of this card starts to spin at maximum speed when I power on the rig and stays like that until I do windows reboot.
I checked bios settings but there's nothing particular to indicate this issue.
Only thing left is to reinstall windows but I think doing that would not fix the problem.
Does anyone have any idea what can I do to fix this problem?
Regards.