8GB (4GBx2) Team High Performance Memory RAM Upgrade For Dell Dimension E520 XPS Generation 5. The Memory Kit comes with Life Time Warranty. at Amazon.com
Dimension E520 Part 3 - upgrades and new home - YouTube
Parts-Quick 1GB Kit 2 X 512MB DDR2 Memory for Dell Dimension E520 E521 Desktop PC2-4200 533MHz DIMM RAM at Amazon.com
Dell E520 Dimension case, power supply, motherboard, 8GB RAM, Intel Core 2 Duo | eBay