On your motherboard, leemon, there are a number of slots, into which you can install memory modules. If there are three slots, different motherboards have differnet numbers of slots, you can install 3 memory modules. Your motherboard will have a limitation to the size of memory module it can use. Older m/bs might be restricted to modules of 256MBs or less, therefore, if they have three slots, the maximum amount of memory they can have installed is 3x 256MBs = 768 MBs. Newer m/bs might support modules up to 1024MB in each slot.
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