I use 3 Vga
GPU0 4GB Sapphire R9 290x
GPU2 2GB Asus R9 270
GPU2 4GB MSI RX 480 X Gaming

First run (no mod) GPU2 : 24Mh+ : Core clock 1275, Mem Clock 2000

Second run (modded) GPU2 : 30Mh : Same clocks, so: 1175, 2080

http://img-cdn.filefactory.com/embed/xl/13pdcr66nxex.png

Greetings!