GPU speed sudden reduction

[eliote]

With superuser permissions, enter the command: aticonfig --uninstall

for sdk you just need to delete the directories.

Thanks.
But drivers seems to be kinda stuck in the system, I've removed my previous installed drivers version- 11.9 - and then installed the 11.4 version over 3 times; each time I checked if the process went well, the Catalyst information shows that I still got the 11.9 version!!! which was not what I looked for...
I think It would be call as a mess up! right?