Got it going at 13*125...I don't have a 12.5 option and 12*133 unstable. CPU runs at around 39 deg.
I had to creep up on this setting..started at 13*100 and went up in 5mhz steps rebooting each time..had tried 12*133 stright off and no joy.
The speed an amd athlon runs at is not it's number..an xp2000 is a bit over 1600mhz the 2000 means that AMD think it performs as well as a pentuim 2000Mhz, but it actually runs slower. so an XP2200 at 1800Mhz is bout right
I did have a well handy link that went into detail about what clock speed various athlons ran at, but once i had picked the fasted CPU my mobo could use i deleted it.