Replacing an overclocked CPU

I have an overclocked Athlon II X4 and I wondered if I needed to do anything before I replace the CPU? Should I remove the overclock?

yes, it's a good idea.

once you know the new chip is fine at default speed, you can start clocking it again.

each individual chip will overclock to different speeds - maybe the new one won't be stable at your old speed, maybe it will go higher...

Well, with my Athlon II x4 620 I could only get a stable 3.5GHz overclock. I'm upgrading to a Phenom II X6 1055T. And Phenoms have set world records for overclocking :)

I can still smart OC. :)