How many modules

if thats your mobo.. then you would have to get the crucial memory that it supports

Type: Dual channel DDR400/ 333/ 266 -184pin

as for the memory modules.. if that is ur mobo.. it really depends on you since u have 4 slots.. u can use 2x256 or 1x512.. just depends if you want to upgrade later on the road.
 
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