parts-quick 2GB Compatible Memory for Acer Extensa 5220-1A2G16 DDR2 PC2-4200 Laptop RAM at Amazon.com
Specs Acer Extensa 5220-201G16MI 39.1 cm (15.4") Intel® Celeron® M 1 GB DDR2-SDRAM 160 GB Intel® GMA X3100 Windows Vista Business Laptops (LX.E870Z.187)