does RTFM mean anything to u?
heh j/k, but normally the manual from your motherboard states what kind of RAM your mobo uses..
if you didn't know, DDR SDRAM has just NOW begun to be utilized on motherboards, but only ones that are using a certain chipset that supports DDR SDRAM.
for the Athlon, the only chipset out right now that supports DDR SDRAM, is the AMD 760 chipset.
the board you are using doesn't have an AMD chipset first of all, it uses a Via based one.
There's your first clue!
second, the name of your board specifically mentions the name of that Chipset, the Via KT133A, which is popular because of the fact that the FSB is now easily moved up to 133mhz, therefor overclockers can do that without worry of damaging other components, because this chipset allows everything else to run at normal speed while the FSB moves up to 133mhz.