i can only use dual displey if i want to use dvi-dvi-hdmi but on there webside it says that i can use it
What monitors do you have connected the graphics card and what is the version of the graphics driver installed?
i got a viewsonic VA2342 and a samsung syncmaster s22b350 and a 19" old hp monitor
The two monitors connected to the DVI ports on the Radeon R9 270 must share the same timings in order for the 3 display setup to work. In your case the monitors connected to the DVI ports are not identical. This suggests that their timings are different and doesn't meet the requirement of the graphics card for 3 display Eyefinity.
Retrieving data ...