last issue, ht...

some people from forumdeluxx complain about issues with high ht reffreq just like you are, i simply dont now whats the cause.

did you set htt boot up clock and cpu host clock the same when you try upping the ht ref frequency?

the other thing: getting wrong vcore setting (lowest p-state vcore) in pwm section and no boot after save/exit happens to me as well some times but can be cured by simply hit reset and let it boot again. dos this work for you campbell?