@Matthew
Your results were:
SGminer GM 5.5.5
RX 470 Samsung 915H/s
RX 470 Elpida 890H/s
RX 480 Samsung 920H/s
Which Paramers did you use to achieve this results (-w -g- -rawintesity)
THX in advance
It was the old best setting 512 4 2. Not that good with compute workload.