Yes I'm using hdmi.
Now the specs are:
Mobo: gigabyte 970a ud3p (It has 2.0 pci)
Gpu: msi rx480 gaming x 8 gb
Cpu: fx-8320 (Oced to 4.4ghz)
Ram: 2 sticks of 4 gigs each.
I could get into more details but I think those are enough.
HDMI, I have just seen enough of these cases now, new builds and HDMI just won't work, if your display supports DVI please try that first, install drivers, set up things and try HDMI again, I just feel DVI will work. PCI 2.0 may be an issue, but give dvi a try.