From an engineering viewpoint this card is an impressive feat. Two full-fat Hawaii GPUs on a single card? THIS IS SPARTA!
However as usual, AMD botched the implementation. The idle fan noise is poor, and the VRM heat is worrying, but it's the coil whine that kills the card for me. If I'm gonna fork out fifteen hundred smackers for a graphics card, it better be fast AND quiet.
Overloading the PEG power connectors (by more than 100%!!!) is asking for trouble, you just know someone is gonna buy one of these cards and hook it up to a cheapy PSU and then blame AMD when the whole shebang catches fire. However I'm not sure what else AMD could've done, short of putting quad 8-pin connectors on, and thus making the card that much longer.
The increasing number of cards requiring more than 300 watts PEG power suggests that a serious amendment is required to the ATX and/or PCIe specs. At the very least I think we need to see max PCIe slot power draw (from the motherboard) doubled to 150W and a new PEG power connector (10-pin?) that can deliver 250W... hence a 2x 10-pin card would be able to draw 150 + 250 + 250 = 650W. Considering that 8+8 pin PEG power (375W total draw) is only slated for ratification in the PCIe 4.0 spec, which is still at least a year from being official, I'm thinking that AMD's next dual-GPU card might need to include its own PSU!