Well the cards are basically the same. but the 760 is just a rebranded 660, and slightly tweaked. The 760 is going to have better driver support and stuff like that. Here is a comparison.http://www.game-debate.com/gpu/index.php?gid=882&gid2=874&compare=geforce-gtx-760-vs-geforce-gtx-660-ti
And that is a high end i7 processor. Sure its a little older but it is still gonna do its job. I mean your talking about a quad core here. Just about any quad core could handle any gpu. Except when your processor is like a core 2 quad. Then that's getting to old.
So the answer would be no. Its not going to bottleneck any!