another thing you can try checking "force constant voltage" in msi settings. Like i said before, ive had this on a couple occasions and sometimes it was an easy fix like reinstall msi. If all else fails and you dont want to reinstall os, i had big success using a ati tool/script that once i double clicked it, it would run and take maybe 2 reboots to complete but would wipe all ati/amd drivers off. I then installed fresh copies of catalyst/msi and it was back to normal. I wish i remembered/had that tool for yah, maybe some1 else knows what i'm talking about and can point you to it. What catalyst/appSDK are you using?

i think your problem lies with os>drivers. Was it working and then all of a sudden one morning its like this or what?