I tip my hat to both AMD's and Asetek's engineering teams, they have accomplished what IMHO was impossible, taming two fully featured Hawaii XT cores using a single 120mms radiator, and designing a single board with 1024 lanes of DDR5 memory, they clearly had a no compromise design in mind, and they achieved that goal obviously.
Amazing performance, low noise levels and temperatures, what a big difference investing in a premium cooling solution has done for the beastly 290X core, still, IMHO, if you have the room for two cards it's a better deal than going for a dual GPU single card, but boy, what a fantastic piece of engineering this card is!
The writing is on the wall, this card is probably going to be as fast if not faster than Titan-Z, and at half the price again, see boys and girls? this is the reason why we need a healthy AMD to bring the heat to Nvidia and create a competitive environment, at $1500 I would personally not buy this card, but you can bet the bean counters at the green team are at full alert mode trying to figure how to compete with this card at this price point, 780X2? Who knows.
You have to give AMD's engineers credit for this one. They crammed a 1024 bit memory bus, and enough circuitry to provide 500W of power all on a normal height reasonably long PCB. One other site said the PCB is 14 layers, which is quite an achievement.
You posted this while I was writing my post, it's eerie how similar our conclusions on this card are, you know what they say about great minds....