Install 16.12.2 driver. This help me run RX480x6 cards on Z170A pro carbon.
Hi. Did you enable your 4g? Or you didint change any in bios? Thank you!
Manual setup BIOS here -
http://mining-hardware.weebly.com/blog/msi-z170a-with-skylake-cpu-bios-mod-tolud-6-gpu-success-step-by-stepI use last original BIOS from MSI without change in file + "Above 4G Decoding" enabled.
4 ASUS RX480 8GB + 2 MSI RX480 8GB work fine.
With 17.5.1 work only 5 cards. 5 + 1 card = BSOD.
With 16.12.2 all work stable without problem.
Use Display Driver Uninstaller (DDU) in Safe Mode before install driver.
My OS - Windows 10 x64 UEFI boot.