I have used instant overclocking features with an AMD chip in the past and had no issues. I've heard stories about overvolting, but I never saw it. In fact, the mild auto-OC that I got was at stock volts. That doesn't guarantee that you won't have issues, but I tend to think that manufacturers wouldn't include presets if they weren't safe for the supported CPUs. Just make sure to check your voltages after applying one.