Outside of guys who use Cuda at home and don't want to fork out way more money for a professional version there really isn't much to talk about tbh. You could buy 2x680gtx since they launched and have more than this performance the whole time.
THe dual gpu card, wow, 4870x2 basically on launch with vastly increased value, awesome, the 3870x2 was less awesome but still good, since then the cards are taking longer, hitting that "too hot too loud" to be worth it point and so late, what the hell is the point.
A few weeks after the 4870 was available a genuine alternative with 1gb mem and cheaper than two separate cards was available, the 690/7990 and Titan are SOOO late to the game, who cares about them. You wanted SLI of xfire, you could get more performance than any of these cards, over a year ago........ If they'd at least bought them out at vastly better value than two individual cards there might be at least a slim reason to go with, louder, worse cooled, worse overclocking dual cards, but there isn't.
A single gpu vs two is preferable, but the cost, lateness, and impending new AMD/Nvidia cards, make the consumer version of GK110 just utterly worthless, unless you need Cuda/DF performance as I'm going to presume Nvidia's new cards will not include big DF performance again in a bid to save die size.
I'd also guess that, the 85% will be more geared to high res, high bandwidth needing area's where the GK104 bogs down, not that its a bad thing, for $900 you'd be mad to buy that for 1080p, however for most people who game at 1080p I wouldn't be surprised if it wasn't dramatically faster than a gk104.
