Well, leaving FSB the same, try lowering the multiplier and saving to CMOS and rebooting. Somewhere on the screen during post it will display your CPU overall speed in MHz. Simply divide this number by your FSB. If you get the number you set the multi at, congratulations. If you get the same number it was at before (as far as multiplier) but you know you set it at some lower number, then it is not unlocked. Or, you can use a program like WCPUID to check these numbers.