You did not post the clock settings. perhaps gpu 0 has better clock settings than the rest.
use asrock 970 extreme 4 windows 7 + 2x pci-e powered risers for the small pci-e slot all stock, can not use any amd tool, it says driver not installed.... Driver install many time, ok in windows. use tech power gpu z amd monitor no info
windows 10 the same, slower speed for all gpu,s gpu 0 faster, no amd tools
amd driver 15.12 not possible to install stays on 2% missing windows update's??? or anything? use 16.10.3
