You need to use Windows 10 1709 (Fall Creator Update) and 17.11.4 AMD Drivers and don"t forget to change mode to COMPUTE for all GPU.
...The drivers i am using are 17.30.1029 and there isn't anywhere that i can change the settings to compute as i have read elsewhere.
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Driver version 17.30 is beta version supporting chainblock. This version does not have that selection.