1)are all of the i3 processors locked??cause i don't see any processor with K behind
2)If not,how can i know which one is unlocked?? I'm using intel i3 540 and i'm looking forward to overclocking it
BUT .... make sure that your Motherboard can handle OC, read the manual or search the model online, look for Power Phase Design, if it's 4+1 or similar then by all means DON'T overclock, it'll fry your mobo
If it's 8+2 then it's safe to OC.
Also check that your PSU have enough power to sustain your PC when OC'ing