I read in an issue that it was core-sync problems with Dx9. Some games gets REALLY slow, as in 10 FPS when I could otherwise get more than full. And since it happens with both frame limit and DSP throttle now, it can leave you with unplayable games (since it's too fast without a limit)
Specs: intel i5 3570k @ 3.4GHz;
16Gb RAM; Raedon HD 7900;
Win8 64-Bit
16Gb RAM; Raedon HD 7900;
Win8 64-Bit