Essentially that is it, but it may not work... The way that the chip co's tend to get their chips is they push them till they don't work, clock them back a bit and sell them as that. If it was stable, theoretically, they would want to sell them as the faster chips. However, since they can't test them all, some good ones are around (especially in the celery's).
Go up a little at a time. Try 75mhz, then 83, then 100. If you jump to 100 it may or may not work. You may have to up the voltage as well just slightly... Read around before doing it, you'll be happier you did
I call it "No-Pants Wonderday," but it turns out the police just call it "Thursday." Go figure.