Comes down to:
Look at top of chip
Get a 2B pencil
Draw lines to rejoin the L1 links i.e. turn ":" into "|" for the 4 lines.
Chip is then unlocked (so changing the multiplier and clock speed on your motherboard will then work).
Set clock and multiplier on board to 133/266 and 8 respectively.
If machine boots up then great, if not then try a lower multiplier.
If it doesn't want to overclock then remove the pencil marks with an eraser.
If you follow the first link and read the OVERCLOCKING section before trying then you should have no problems.