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#21
Yeah, I would agree to just try it with the 4GB. Upgrade later if all works satisfactory.
The specs for the Pavilion 2000-219DX says it uses PC3-8500/10600 DDR3 SDRAM SODIMM 204 pin. It can use a max of 8GB. There are 2 slots. So to upgrade you would have to trash one or two 2GB modules and replace them with 4GB modules.
You'd probably only find those online or in a computer repair shop.