Considering you have 1080p and 60hz then 770 is enough. Everything else is "too" much. You won't see much difference when you compare 770 and 290 on 1080p. You will notice the difference of 290 when resolution goes up and on dual monitors. Basically, 290 will outperform 770 on those settings. But if you are on 1080p 60hz then 770 is "enough".