That means the 9800GTX will be £840 then.. Who's going to pay for the card after the 9800GTX at a MASSIVE £1680???? No one, it will never get to this price as when a new product comes out, it pushes the older products price down..
Your logic makes no sense to me here?
Hes saying that, since the 9800GX2 is just two 8800GTS' strapped together, its logical it will cost about the same as two 8800GTS'.
It does, and that's not a bad thing because if you REALLY wanted SLi GTS' then this would be a much better solution than two cards at exactly the same price.
The 9800GTX will be a single GPU solution and i imagine it will cost around £350-400 just like the 8800GTX did.
On a more serious note, I could see nvidia trying to sell this at a silly price, they've got brand power on their side with the less knowledgeable seeing nvidia's cards as the must have regardless of its true specs (I know of some one who thinks 8600s are faster than 2900s/3800s because "8600" is a bigger number). I just hope ATi do themselves a favor and price the 3870X2 well, I suppose realistically they shouldn't (or couldn't really justify to consumers) sell it for MORE than 2x the price of 2 3870s as I'd say that would be defeating the object, plus it's technically more on less silicon being all on one board so it should in theory cost less to make than 2 3870s. Unless I'm totally wrong on PCB/chip production costs. 
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, GX2's gona be about £600 smackers then, line up boys, drop yer keks, bend over and spread em, Japanese flags all round.