I have been considering getting another 680 for a while now. I have a vanilla EVGA, so it only has 2gb vram. I was wondering if I should get another 680 when the 700 series arrives, or could I SLI a 770 because it is a rebrand? Or should I sell it and get a 780. The 780 looks to me like what the 680 should have been. With 2496 cores (I believe or around there) and 5gb vram. Holy ScheiBe! I don't know how much of an expected increase I would see though going from a 680 to a 780. If my 680 had more vram I think I'd just stay with that and SLI no problem. But say the 780 is 20% better or 30% better would you guys consider upgrading?