does the ABIT AA8-DuraMAX board require 2 DDR2 modules?

i went to a local store and picked up this board and 1 module of Kingston Technologies 512MB PC2-4200 533Mhz DDR2 Memory. the clerk helping me mentioned that i may have to run 2 modules. he quickly looked into it and said id be ok with just 1 but he was not completely sure.

then today talking to an instructor of mine about this situation he was not sure also. hes kind of out of date with these things and was actually looking into himself but he was almost positive that id have to run 2.