11.8 preview fixes the problems of hangs while mining and watching videos.
11.7 WHQL fixes it too, but both 11.7 and 11.8 now trigger max cpu usage in *any* opencl app.
thats SDK problem, not the driver... try using OpenCL 2.4 and 11.7 or 11.8.
I've tried different SDK versions, and 11.6 never gave me 100% cpu usage. 11.7 however ALWAYS gave me 100% cpu usage.
It's a driver bug.