Hi,
I have 4 x Sapphire rx480 8gb and 2 Msi Gaming x 470's
I am using Vdrop+ bios on the 480s and undervolting -100 they are getting 29 each, the 470's i cant remember which bios im using but they get 28.5 each,
https://s1.postimg.org/6aybwn4r3/Capture.png - looks like gpu4 is on a go slow when the pic was taken
oh and at the wall the whole rig is using 860W
https://s11.postimg.org/h9zkzc3oz/Screenshot_20170420-155231.pngClocks
480 Core 1125 Mem 2080
470 Core 1150 Mem 2000