Would it be? I haven't seen any full spec'd GF104's lately, have you?
And then there's the fact that creating a large chip based off of GF104 fundamentals would be incredibly risky. Building huge chips takes a lot of money, time, and engineering resources. If this chip failed to live up to NI, it would not make sense to produce, much like GT200 did not make sense to produce after cypress hit. For Nvidia, a lot of this probably depends on whether they could create a full product at good clock speeds, and this may be uncertain until they actually get silicon in hand. Worse yet, with it's DP and GPGPU functions stripped, this large die would also not make sense to produce for the lucrative professional market vs. GF100. So you have the risky proposition of wasting a ton of resources on a huge die product which may be immediately obsolete and unsellable.
I think the best thing for Nvidia right now is to admit defeat, and plan to come back with a vengence, like AMD after R600. Perhaps they can make their own RV770, or if not then seperate game and GPGPU architectures. Attempting to make a giant die stop-gap poduct is not a good use of resources, and Nvidia has enough money (and the pro market) to sustain themselves for awhile.
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