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What it probably says is "Front Side Bus" like 133Mhz FSB or 200Mhz FSB or 266Mhz FSB, etc.. Front Side Bus is the speed in which the processor interacts with the onboard chipset. So, an AMD T-Bird 1.3G is either 200Mhz (FSB) * 6.5 OR it's a 266Mhz * 5. Etc. Does this make more sense?