Limits? That you'll have to find out for yourself. Just keep bumping the fsb a few MHz at a time until it becomes unstable. If you want to go further, up the vcore and bump it up a few more until it becomes unstable, then up the vcore again, and repeat the processess. Carefull though, if you're going to be overvolting, keep a very close eye on the temps. Overclocking alone doesnt effect the temp much, but when you overclock and overvolt, you'll see it climb.
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