Retro Dell Optiplex GX520 Full Tower Intel 2.66Ghz 512mb ram 40GB fresh XP Pro | eBay
DELL OPTIPLEX GX520 NO RAM NO HDD NO OS CHASSIS. REFURBISHED. IN STOCK.
OFFTEK 1GB Replacement Memory RAM Upgrade for Dell OptiPlex GX520 (DDR2-4200 - Non-ECC) Desktop Memory at Amazon.com
NeweggBusiness - DELL OptiPlex GX520 Desktop PC Pentium 4 3.0GHz 2GB 160GB HDD Capacity Windows XP Professional 32-bit 3 Years Warranty for School and Colleges only (Verification Required)
Upgrading Ram in the Dell Optiplex Gx520 - YouTube