An interesting observation, though I'm not sure if that's indicative of AMD improving the CPU-utilization side of their driver or what.
I ran the Unigine tests and the results were inconclusive. Tropics was the only test that showed up faster with a small non-trivial increase in score, while Sanctuary actually reported a lower score by a small non-trivial amount. Valley showed no appreciable change. Heaven crashed a lot. Not sure if the crashes were due to CPU degradation from all the overclocking I've done, or if they were driver-related. But they were hard-locks so I'm guessing the former (sigh).
I also ran 3DMark11 and 3DMarkVantage. I dropped maybe ~200 points in Vantage (went from 9590 to ~9370) and gained maybe 60 points in 11 (went from 2877 to ~2940).
Overall, I'm not seeing a consistent trend outside of the latest 3DMark tests. Vantage should have had an increase in performance somewhat in line with Cloud Gate if the driver is indeed doing a better job of spreading draw call overhead between CPU cores, but I saw minor performance regression. Sanctuary should have seen an even bigger boost than Cloud Gate since it's much closer to being CPU-bound (average FPS in Sanctuary is around 77-78 on my A10-7700k), and yet I saw regression there. Running in DX11 mode (instead of DX9 default) changed nothing.
The skeptic in me thinks that what we may be seeing are some driver optimizations, particularly for APUs in preparation for the Carrizo launch. Ice Storm will be one of the more popular graphics benchmarks for Carrizo systems given its power envelope. If those optimizations carry over to titles that are more likely to run on Carrizo laptops then hey, all the better. Older benchmarks don't seem to be benefiting much from it, though.