the fastest way to get an answer to that is to use the memory configurator at one of the Evendor sites.
http://www.zipzoomfly.com/jsp/Special/Memory-Conf.jsp' ">http://www.zipzoomfly.com/jsp/Special/Memory-Conf.jsp
and read all thetech data that it comes up with.
this one is to a memory manufacturer.
http://www.crucial.com/index.asp' ">http://www.crucial.com/index.asp
but i think you are going to find that the asus board is only going to support pc2700 or a DIMM that runs at 333MHz.
it can be used in the auto mode to run at 333MHZ if it is a DDR 400 DIMM.
I USE MINE THAT WAY.
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Zonian