There are three main things, number of pins, speed, and type. You can usually find that in the computer's documentation or manufacturer web site. For example mines DDR DIMM 184-pin, PC2700. 2700 is the maximum MHz the mother board can take, and DDR DIMM explains how the RAM is utilized. Definitely check the specs for your computer because there is often a max RAM. Even if you could get a 2GB stick, your motherboard may only be able to accept 1GB.
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