>The computer has two memory slots, both filled with 1 GB memory cards.  
>To get 3 GBs memory cost $50 additional at HP, so I reasoned that 
>throwing away one of the 1 GB cards and adding a 2 GB card in its place 
>would be cheaper.  Where to buy such a memory card?

I use datamem.com. Good product and service without the overcharging.

>The spec says DDR2-800 MHz SDRAM.  Do I need to know more than this to 
>buy a memory card?

You can typically search for the RAM using the computer's make and model. 
There are usually notes about any special conditions you need to consider.


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