I tried the new driver with rx550 rx560 rx 570 and rx 460. my result were as follows.

rx550 - unstable with original oc settings
rx560 - unstable with original oc settings
rx460 - no change
rx570 - no change

5 rigs - 72 cards - 1.230 GH/s win7, win10, ubuntu 16.x server and hand rolled mining OS.

::food for thought::
IMO mining under 30 cards with the capital gains tax will make it non profitable in Q1-Q5.