as you approach the high end cards, the performance/$ generally drops, so effectively less value. Depends what you mean by 'worth it'. If you have $500, then the 780 will perform better and will more likely max out all games at 1080, 60fps for longer. Whereas the 770 may not do with some current games or future ones. Have a look at reviews for the 770, to see if it maxes out all the games you want to play (assuming you want them maxed out).