See step by step how to upgrade your Acer ASPIRE ONE ram to 1 GB or 1,5 GB (maximum). Inside this laptop there is a 512 MB ram soldered in the mainboard, so you can only add a PC4200 533 Mhz 512 MB / 1024 MB module. However, even Windows Vista works like a charm only with 1 GB ram in this netbookWindows Vista Business Experience Index with 1.5 GB RAM / 120 GB HDD / Atom 1.6 HT:\n\nCPU SCORE: 3\nRAM SCORE: 4.5\nWINDOWS AERO GRAPHICS: 3.9\n3D GRAPHICS: 2.7\nHDD SCORE: 4.9\n\npretty good, huh? (constantly there are 600-800 MB of memory usage) acer, aspire, RAM, Upgrade, vista