awesome article on xbitlabs testing 560 SLI
http://www.xbitlabs.com/articles/vid...i_7.html#sect0

At the highest resolution the SLI configuration is comparable to the GeForce GTX 570 SLI tandem we tested earlier in scalability. Its performance increases by an average 70% over that of the single card. The maximum performance boost is as high as 105%. Its advantage over the GeForce GTX 580 and Radeon HD 5970 remains the same at 19-21%, though. Compared to that, the GeForce GTX 570 SLI tandem enjoyed an advantage of 42-43% over those cards. Thus, the GeForce GTX 560 Ti SLI delivers comfortable performance where the single GeForce GTX 580 can do the same and even fails in BattleForge and S.T.A.L.K.E.R.: Call of Pripyat.

So, a dual-GF114 graphics card wouldn’t be competitive as a flagship solution. It might be fast but only about as fast as an ordinary single-chip GeForce GTX 580.
so nvidia is in a tight spot...
dual 114 scales well, costs less and runs cooler than dual 110, BUT it reaches a perf spot their 580 already conquered months ago...

so they HAVE to go dual gf110... which means heat heat heat and some more heat... but how are they going to take care of the memory width issue? and where will they put all the memory chips? dual pcb again? phew!