straight from the AMD website
AMD Athlon? processor with a 266MHz front-side bus supporting PC2100 DDR memory technology is available at 1.2, 1.13, and 1GHz.
AMD Athlon? processor with 200MHz front-side bus supporting PC1600 DDR memory technology is available at 1.2GHz(1200MHz), 1100, 1000, 950, 900, and 850MHz
but you already looked there.. i would guess that when you buy one it would say somewhere before you make the purchase, like in the description what FSB the proc is designed for.. i don't see a section on AMDs website with spec info like Intel provides (tsk tsk tsk)