A New FSB Clock Requires A New Athlon Processor
A faster bus clock requires smaller clock multipliers to reach the same processor clock. While the recently released Athlon 1200 ran at 12x 100 MHz, an Athlon 1200 for the new AMD760 comes with a multiplier of only 9x. On the other hand, the new front side bus could prove extremely helpful for the overclocking of Duron processors.
You can tell an Athlon for 133 MHz FSB from the letter 'C'. The 'old' Athlon for 100 MHz FSB comes with a 'B'. Besides that there isn't much of a difference between the 100 MHz-Athlon and the 133 MHz Athlon processor. Let's have a look at the power requirements: