that is a different overclock; your board means for the CPU. the graphics overclock has nothing to do with it. the oc "out of the box" means it runs at the graphic card manufacturer's highest specifications.
it will work and nothing will be damaged
ohh, it's fine then, thanks for the explanation!
I would be more concerned with your PSU than the mobo itself. See to it that you have true rated power of at least 500w.
I have an antec bp550 plus 550W, so it's ok, I guess.