For mixed rigs Fury + RX4xx you won't be able to get full speed from Fury because latest good drivers for Fury is 16.3.2 and they don't support Polaris. 16.6.2 and higher support Polaris but they cannot provide full speed for Fury.
Thanx for response Claymore. Will try to use 16.10.1 as suggested by nd see the results
Still it is not clear why ASM option does not work for Fury under 17.1.1 and shows 0 sols?