Boom, i know you love Nvidia, but, come on, He has told some pretty good Lies before. Jokester made reference to one whopper he told. The two examples you gave for power use are bad examples. The 5800k to 6800k are APU's, the powersaving was made by managing the way the cpu and gpu work together better. For your other example, the 4870 and 4890, you do realise that the 4890 was a different chip entirely? RV770 to RV790. Even if they were the same chip, it still wouldn't support your argument, because while the 4890 used less power at idle, it did use way more under load.
We know the 780Ti is a GK110 chip. We know the GK110 is very efficient as it was designed to work in supercomputers with strict power demands. You think they are somehow magically create more performance for less power?
It will definitely be cooler and quieter than the 290x but will it be cooler and quieter than a stock 780?
But you would have to be living in dreamland to think it is going to use less power than the titan.