There is a slight chance of bottleneck to occur. If you're willing to upgrade your CPU, get an high-end i5 fourth generation CPU like i5 4670(K) or i5 5690(K). You don't need an high-end i7 for gaming.
The i7 920 is pretty much the first i7 using micro-architecture dating back to 2008....It is roughly 30-40% slower then it's Successor the i7 2600k. I would imagine that the GTX 780. 780ti and Titans will not perform 100% especially in CPU bound games such as Battlefield 3 and 4
There is a slight chance of bottleneck to occur. If you're willing to upgrade your CPU, get an high-end i5 fourth generation CPU like i5 4670(K) or i5 5690(K). You don't need an high-end i7 for gaming.