I was 3gb/s off on my estimated memory bandwidth, damnPretty good guess though I'd say.
The 5870x2 will still be faster but if there is in fact an official 5850x2, it might just trade blows with it. Nvidia won't hold the single board crown until they manage some kind of dual design but their single gpu performance should be top of the pile.
I expect it to be priced around $450-500 or so (with the 360 at 5870 price levels), and it might turn out the the X2s end up launching at more than AMDs said 500 (edit: that would have been likely with a Q4 release, a Q1 release gives them no competition still )due to this new information ( either that or all the prices will slide down a fair bit) I'd be as bold to guess that a GTX380 might be 20-30% faster at times single gpu so it should be a pretty impressive product. However it still is a more expensive design to produce that R870 by a fair amount ( raw specs say this much ) so I don't expect their prices to fall much in the months after release ( that and the performance advantage they'll offer ). The 360 model will likely trade blows with the 5870. I think SLI 360s will be quite popular that said ( assuming they don't red ring... oh my bad )
The final question is when will we see them in mass. I'm going to guess mid to late December at best assuming the rumored November launch ( as with the 8800GTX / 680i with their November *paperish* launches, availability was somewhat weak for about a month ) EDIT: Scratch that, Anand says is still toting the Q1 release card. That said, a 20-30% increase ( a fair guess if you ask me ) 4-6 months after the competition isn't that amazing but required, I don't feel bad about getting a 5870 with this much of a time gap.
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