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#11
Computer memory upgrades for Acer Aspire One 722 Netbook from Crucial.com
According to Crucial, the Aspire one 722 has a single DIMM slot. They'll sell you a 4 GB module for it, guaranteed to be compatible.
How well does Win7 Pro run on a netbook? If it's a bit slow, I doubt that upgrading the RAM will help much.