I had issues with not being able to power the monitor via HDMI prior to vid driver install,just a black screen.DVI solved that for me 
Good Point. I will try with DVI cable and see how it goes as HDMI and VGA cables did not help only to show no signal.I had a HDMI (vid card) to DVI (monitor),a DVI to DVI worked.
I am going to get R9 380 ....