I have a xp2900 barton and want to overclock but the board I have now doesn't have the multiplyer option but I will update the mobo soon. Wasn't there a list or something saying which cpu were locked?
its not just the cpu rating its also the week it was made, because after a certain week they started locking them. When it locked it means you cant change the mulitplier. You can still overclock it but this means raising the fsb, and so raising your memory speed, so needed better more expensive memory.
I'm pretty sure it does have that function. Every motherboard has that option... Try pressing whatever key it suggests. If it is not suggesting any keys for you to press, then try delete, F10, F1, and F2.