6GPU rig is not possible with RX580 due to driver issue (17.4.3) (in Windows)
We don't support or validate using more than 4 GPUs, so this behaviour can be expected. I would suggest trying an older driver that worked.
Sorry but RX 580 is new, the other driver does not work. I tried it but it did not work!
There is a driver issue, with RX 480 it is possible!!!
We don't support more than 4 GPUs, so the configuration you are using is not supported and so we will not dedicate our valuable engineering resources into fixing this issue.
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