I see that Sony Vegas 10 will be using the new (announced about 6 months ago) CUDA-based MainConcept h.264 encoder. Is there any chance that PPro CS5 will be doing the same in the near future? Note that this encoder uses CUDA for exporting the timeline, unlike the MPE which uses CUDA to accelerate FX and transitions, when previewing.
Those tests may be a bit misleading, as these days, it's possible to purchase a workstation with 12 physical CPU cores. The discrepancy may not be as great as in the benchmark that was presented.