I wasn't aware Turbo Core in AMD even reported like that. It shows the the Maximum Frequency of the boosted cores, but usage (MU) is always just 100%, even when doing something like Folding@Home or CPU benchmark.
Terragen is the only program so far that will show overhead with v3 clouds and I guess path tracing.
This does seem to correspond to the Intel's Turbo Boost but I wonder why I don't see it with something like a straining cpu benchmark?
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As for Path Tracing this scene, to my eyes, it gives a much better desert impression than standard renderer. The extra brightness in lighting and the shadows on the far-side of the mountain.