tony, there are some cpus that have low max bclk's, and you may just be unlucky....I did not read all your messages, but I assume you hit load optimal settings and save after each bios change to get the settings of the new bios. Also, I would try running with 1 stick of ram, if does not work, try different 1 stick of ram. Earlier I had 1 stick ram that was defective that was screwing up my OCing. Also future bioses may help. I am stable at bclk of 200x21 and even 205x21 with prime on F4j and F4m (extreme), but on bios F4, I cant get any higher bclk than 170's, so something screwy in F4 bios on mine.