Hi there. I've installed the latest Crimson driver edition and overclocked my GPU to a state I know it is stable (tested several times before) and applied the changes. I have a Radeon HD 7970 and overclocked it to:
Clock speed: 1050 MHz
Memory Speed: 1480 MHz
Now, it runs fine, but: When I tried to undo this overclocking, the memory speed was stuck on 1480 MHz. I was able to delete the profile to get back to stock speeds for both the GPU-clock and the memory, but once I try to create a new profile, it starts at 1480 MHz at the memory side. (left side of the slider does not start at stock clocks but on the last overclocking-speed, not being able to slow it down anymore) This could be an issue if you overclock it into instable regions, not being able to go back. To my luck, this speed is stable, but it doesn't change the issue of the "jumping" memory speed in the Overdrive-mode.