It can only be one of the two: Front Side Bus or Memory Bus.
And then which one is that: Real Clock or Effective Clock
But I guessed that you cannot get back to the BIOS to change that ... hm
I dont have an an ASUS A7k8N Nforce2 mobo but if anyone can check for the hard reset to default condition switch/jumper ?
Good luck ...
Edit: So what did you do ?