For reference, RX 470 and 480 running at 1150MHz core clock:

KECCAK:
-dcri 8, anything above that causes a major drop in ETH hashrate
RX 470 = 180MH/s
RX 480 = 200MH/s

BLAKE2S:
-dcri 50 with no drop on ETH
RX 470 = 1300MH/s
RX 480 = 1450MH/s
-dcri 60 with ~0.5MH/s drop on ETH
RX 470 = 1500MH/s
RX 480 = 1700MH/s