Lol, that's the same adapter I'm getting. How are you finding it? Does it overheat?
I've noticed other 7970's with 6 ports simply forego DL-DVI-D. There must be some sort of limitation with the 7970 itself. Either that, or, it's a cost/power cutting manoeuvre by the resellers.
My Anime List
BattleTag (EU): razaron#1882