Lol! But they couldn't go too far with those OC versions, unless Nvidia somehow improved efficiency. Titan@1 GHz already draws 250W, 265 if you have to increase power- and temperature targets to get there. What Nvidia really really needs to do is to raise the stock targets...80?C is just not enough, the card would get stuck at base clock almost all the time.

Edit:
Is the 780 Ti by any chance based on GK180? It seems that GK110 cannot be used to enable all 15 SMX. K40 and probably K6000 use GK180 and both have the full 2880 cores.