Hmmmmmm....I think you *can* detect the correct clockspeed by software. At least I first had a 160MHz Bliz (66MHz bus) which was very unstable. So I sent it back to P5 (well...twice....due to them {bleep}ing up, even back then their support was horrible ;-)), and they changed the busspeed to 50MHz and changed the multiplier so in the end my clockspeed was 175MHz. And both clockspeeds were correctly reported by some system info tool. Can't remember which one though.
