Someone Somewhere :
Again, you can only drive two displays that are not connected via DisplayPort. All three of your displays are connected via non-DP connections, so only two will work.
You need either an active DP to something else adapter, or a display that supports DP.
I have the R7 240, two DP monitors, one VGA monitor and an Active DP male-> DVI-I female adapter.
I connect
the R7 VGA connector with a VGA cable to VGA monitor,
the R7 HDMI connector with a HDMI cable to the HDMI port of one DP monitor,
the R7 DVI connector with a DVI cable to the Active DP adapter which I connect to the DP port of the second DP monitor and the USB connector of the active DP adapter to my computer.
This is not working!
What am I doing wrong?
The active DP adapter is of delock.com