You shoudnt have a bottleneck until around a 7850 graphics card if you dont overclock. Right now nothing should be bottlenecking. If you do overclock you can probably get up to a 7950
If you want more gaming performance, the 5770 is a bottleneck, you would get much better performance from a better video card. a 7870 or gtx660 or better for 1080p resolution, depending on what you can afford.