CPUs don't bottleneck graphics cards.
There is this HUGE misconception that just because you have a ridiculously powerful card that you need a CPU that's ridiculously powerful as well.
Bottlenecks ONLY happen when two things are trying to communicate directly with each other like in the case of system memory and your CPU. This was mainly a problem during the Socket A days when the FSB REALLY did matter much more than it does today. If your CPU was a 400FSB CPU and your RAM was only PC2700 which is 333FSB, then your CPU would literally have to wait for the RAM during communications.
The CPU and GPU do not directly communicate, therefore, NO there will be no bottleneck whatsoever.
For whatever reason, people seem to have trouble understanding this concept. Of course a better CPU will give you better performance......that's common sense. It's not because your previous CPU was bottlenecking the graphics card.
So next time you hear someone talking about their CPU bottlenecking their graphics card or vice versa, smack em, because it's not possible. Two things have to be directly connected/communicating and one slowing down the other to be considered a bottleneck.
Nope, it wont. As explained above.
Dont worry dude, your system is good to go. Heck you don't even really need a new mobo unless you are looking to get one with better overclocking options and such.