Hi Diablo,
I have a Radeon 6670 running on Win7-64bit and after i upgraded the Catalyst to the last version (11.8 from 11.6) my hardware errors reported are between 20% and 25% and the CPU usage is 40% to 50% (before was under 10%).

Any idea what should i do or where i should look for some info?

Thanks.
edit: forgot to mention that i use the default configuration (launched the .exe using only with the -o, -r, -u and -p options).