They haven't enabled the full Gf104not because they can't but because it will cannibalize the GTX470 sales. You can see that in the many overclocked variations of the GTX460 1GB that are already as fast as the GTX470 The way I see it, the GTX580 just needs to take the performance king crown back. It doesn't matter how much power it will consume, how hot it will get or how big it will be as log as Nvidia's name gets out there. Nvidia doesn't really need the low margin consumer market anymore. They recently finished a deal with the Chinese government for a super computer with over 7000 tesla GPUs which resulted in the world's current record holdrer at over 2,5 PFLOPS. For Nvidia the consumer market is just a way to get rid of all the cores that didn't make the binning process for Tesla and cut their losses.