All i'm saying is that the question should be asked in another terms, in my opinion in the Graphic & Displays forum.
I just don't see the point of saying a card bottlenecks x cpu, it doesn't work the way you do in a cpu, you change a cpu and you can verify 100% if the other one with the same card can be better, with a gpu change, you can verify the card is better, obviously like any other generation step, but not because it will take a huge advantage of the cpu performance(there're several cpus out there that doesn't bottleneck the high end cards of today)
We could speculate what card or not can bottleneck the i5, but you never know for sure.
For e.g. the 480 gtx at 1080p in some games would not get 100% gpu usage, if it's at a lower resolution it can play any game @60 fps, no restrains for the cpu.