Okay, so it does support CrossfieX! The problem is, i have two r9 270x's, but I can't enable the crossfire because the AMD CrossfireX tab does not appear in my control center, any suggestions?
I'm in the same boat, Sena. Just got my second r9 270x yesterday and I've spent the last 8 hours trying to figure out how to get it to work. Fresh Install of OS - Installed drivers with one GPU. Installed second GPU - Brought up CCC and it will not allow me to check the crossfire box. Unfortunately it sounds like I'm going to be buying another motherboard to just make this work.
I fixed it eventually. What i did was: first, uninstall all your cards drivers, second, take your both cards out and run/reinstall their drivers just one at a time, then, switch them (from their previous positions in the PCI slots).