Performance in Synthetic Benchmarks
There is almost no effect from the overclocked frequencies of the XFX card. It scores a mere 51 points more than the Radeon HD 3870.
You can see there is but a small performance gain from the pre-overclocked frequencies of the XFX card. The biggest gain is observed in the second and third tests at 1280x1024, which is due to the modest memory frequency growth relative to the reference GeForce 8800 GTS 512MB. The individual tests agree with the overall scores quite well.