Hello, I just purchased this refurbished computer on-line from geeks.com (where it can be easily seen, just go to their website and "do a search" for: D51S-SFF-5R I think that I am going to want to upgrade the RAM memory. It comes with 512MB RAM, and the listing says that there are "2 DIMM expansion slots available" On the same web page, geeks says that folks who bought this computer usually purchased: "Samsung 1GB DDR RAM PC2100 184-Pin DIMM Major/3rd" Am I correct to assume that I would first need to replace the "factory" 512 MB RAM with one of these Samsung 1G boards? And then I could "add two more" for a maxed out RAM of 3G ? Would this be a smart investment? Can I get a (printed) manual for this machine? Thanks!