Having issues with trying to underclock a Radeon 7750 (causes instability if I don't). I have fully flushed all drivers and reinstalled them numerous times, it still goes back to stock speeds after a while. It mostly happens when browsing but can happen during 3D applications too. The only thing that sorts it out is a reboot, until the problem re-emerges that is.
I have made sure that I don't run anything else that could affect the clocks aside from Radeon Settings.