Also curious about this, but not enough to test it on my own.
Been running 14.7 for a couple of weeks now, its stable, didn't need modded inf for 6 cards on 8.1.
I have also tried the 14.7 RC3 drivers
It does work for me too
So far it is running smoothly and is quite stable
+1, working well for my test rig also, I also didn't realise, it recognised the 6 cards no problems, nice one...