it's simple.......leave it on 133fsb and change multiplier........then boot if it says more than 1900 then yeah, it is unlocked. i don't know about 1900 and up, but i know that for like the 1700, etc........the only way to go past 12.5 multiplier was to connect another set of bridges....i forgot which but yeah. uhmm basically if it says anything diff than 1900 on a 133fsb then it is unlocked. simply changing the multiplier in the bios, as someone said, doesn't mean anything unless it actually does something 🙂