The first thing to do is look over the specifications for the system board to see what memory is able to be used. Some information will be needed as to the model number of the HP you are currently running. The user manual for the main board generally explains how to install memory. Different makes and models boards have varying memory capacity with the smallest amount on the newer board being able to run two 1gb dimms.
By looking over the specifications the speed and type of memory will be seen there. If you add 512mb of memory to a system that already has 512mb then you will have a total amount of 1,024mb of memory installed. With boards now having two channels you would have 512mb on each channel if the dual channel mode is enabled.
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