Interesting comment in this thread: http://www.tomshardware.com/forum/
[...] nitor-turn that you can use both DVI, a DVI and an HDMI, or a DVI and a display port.
I have 2 cards installed though. I fully expect to be able to use an HDMI on each or a DVI on two, etc.
The issue, moreover, is that the 2nd card is "dead" to output and the remaining ports on the primary card are dead as well. The card is clearly recognized and I can crossfire it.. I just can't get a display from it..