The higher your resolution, the less bottleneck will be evident. This is because the higher your resolution is, the more demand is actually placed on the GPUs. Ultimately, with two very powerful cards the bottleneck is probably going to keep you below 100FPS
Since most LCD monitors have a 60hz refresh rate, you aren't going to actually notice the bottleneck in most circumstances. Now, if you got a 120Hz 3D Monitor, I could see a chance of actually seeing the bottleneck affect as you'd need 120FPS to realize 3D (which is really an nVidia thing anyhow).
You should be fine. Would a higher Overclock help? Sure. As would using an Intel CPU, just because they're faster clock for clock. (i.e. an i5/i7 @ 3.91Ghz is faster than your 965 @ 3.91Ghz).