Yep, Tom's has a good comparison for GPU and CPU scaling. The R9700pro scales very well with faster CPUs, so yes, it will be a bottleneck to some degree in terms of max resolution and max framerate. On the other hand, it should perform much better than your previous card at the same resolution, and you'll also be able to crank up bandwidth/GPU intensive settings like AA and AF with less penalty (b/c you are running lower resolutions b/c of the CPU bottleneck). When I say low, I'm talking 1024 at the minium.
4finger- to link hit the macro at the top, it'll bring up two pop-up boxes. Cut and paste your link in the first one and hit enter. Type the text you want to appear in the second pop-up box and hit enter. You can also type the syntax in your text box, but its easier to just use the macros at the top.
Chiz