there were 1000 B's and C"s.
B on the 100MHz FSB (10*100)
and
C on the 133MHz FSB (7.5*133)
look on the CPU core to see whether it is a B or C version, or just set everything to auto in the BIOS.
AXIA was a good OC'ing core that usually made it to 1.33GHz+ (100->133) with a modest vcore increase.