bottleneck performance?

[Raist]

400 MHz can be quite impactful depending on how it scales with other components. The original benchmark performance scaled almost in direct ratio on my older C2D system. 4100-4700 at 3ghz up to 6200-6700 when pushed to around 4ghz depending on various configurations when pushing things to the edge of stability to see if I could raise quality and stay 30fps or better.

I also found that past certain thresholds (about 3.6ghz on the CPU and about 10% over stock on GPU core) I started getting more bang for the buck by ramping up memory clocks--both at the system level and graphics card levels. You can reach a point where it is less of a raw horsepower problem and more of a data transfer issue.