Nope, your CPU will not create any bottleneck at all. That is a really good card but I would suggest you to wait for Pascal/Polaris as they will offer much better performance and will consume much less power. The GTX 1080 beats the 980 ti and Titan X by quite a wide margin. It also only requires an 8 pin connector . The GTX 1070 is also a very good card and it also offers better performance than a 980 ti and the Titan X.