Same thing happened from T-bred a --> B. I have the tbred B2400 running at 2200 Mhz. :) Kris > > > ATHLON XP 2500 CPU: 1.83 GHz > 266 Bus > ATHLON XP 2400 XP 2400 Thoroughbred > 333 Bus > Info from www.newegg.com catalog > > >