at todays prices, its a bit of a question of should you overclock... You can purchase a 1.0-1.2 ghz chip for under ~300 or less (correct me if im wrong) so is it worth it to OC... Anyway, if you do decide to OC, then maybe you could find a pretested chip and/or get someone to sell you a copper tbird (blue core) as they OC a bit better. Also, the higher speed you get, generally the more mature the core is and the better the yield and probably the higher it can get... that is a bit of a strech though but thats the way it "should" be. Anyway, good luck and hope you get a good one... for reference, I have a 750mhz copper tbird running @ 1.1ghz... hence the recomendation of a copper tbird over the alluminum ones...