I had originally planned to upgrade my mobo, CPU and GPU all at once early next year but now that the 970s are out, I am tempted to grab one now. My question is will I run into a bottleneck with my i5-2500k running at stock speed? I have overclocked it in the past and could do so again if it would make a difference in using the 970 efficiently. My mobo is an MSI P67A-GD55 and I have 8 GB of RAM. Thanks!