If you haven't got it yet, chances are it will be locked. As far as determining a max overclock, like you said you will just have to experiment. But I can tell you it will do (200*11) 2.2GHz pretty easily, even on stock voltage often. You will more than likely be able to push it past that with appropriate cooling, and if your mobo and ram will let you.
Just experiment and let us know what you find. Good luck!