I wouldn't talk about what's good, bad, needed, etc until it arrives, we have no idea about the efficiency of the chip, and it isn't final what the power requirements would be as the only card sofar was an underclocked engineering sample and the 6+8 on the card displayed didn't even work, so wait for the retail part before discussing what's going to be needed. Could be more, could be less than you expect, but I wouldn't be making PSU decisions before they even test the first one.