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For the audio with DVI / ATI DVI/HDMI adapter the sound is automaticlty routed to the TV LCD
With DisplayPort + adapters the Realtel Manager send an alert to connect rear sound to TV or similar message
That is not a big problem ( i have 2 * HD5770 with 4 * DVI out )
I think the problem is not with the active adapter but with the XFX graphics cards
Exist 2 models ( mine with 2 * DVI + 1 miniDP 150 euros ) and another model with 5 * displayPort for some 250 euros
and that is possible that the EyeInfinity option is not programmed in BIOS with my low price cards !!
I have not found infos in the documentation
I have send a report to XFX for this problem
Pierre