sounds like an odd setup, throuroughbred chips run at 133-166Mhz FSB So I guess your FSB must be overclocked but 100Mhz is a definate underclock.
Are you sure thats real PC3200 you have in there? for example I have PC3200 RAM but my system reports it as PC3400 because of the overclock.
throuroughbred cores do run at a high frequency anyway, the Bartons are only more powerfull because of they have double the L2 cache. I think he fastest throuroughbred runs at either the same speed or faster than the fastest Barton Mhz wise.