CMS 4GB (2X2GB) DDR2 5300 667MHZ Non ECC DIMM Memory Ram Upgrade Compatible with Dell® Optiplex Gx620 Dt/Mt/Sff - A88 at Amazon.com
User manual Dell OptiPlex GX620 (English - 221 pages)
USED: Dell Optiplex GX620 Tower Computer - 40g HDD, 2g RAM, Windows XP Professional x32, keyboard and mouse - Walmart.com
Upgrading Ram in the Dell Optiplex Gx620 - YouTube
Best Buy: CMS 2GB (2x1GB) RAM Memory Compatible with Dell OptiPlex GX620 DT / MT / SFF Desktop CM128645300DIMMX2001
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Used: Optiplex GX620 Ultra Small Form Factor - 250GB HDD, 2GB Ram, DVD-Rom, 17" LCD Monitor, Windows 7 Home - Walmart.com
512MB DDR2 Memory Upgrade for Dell OptiPlex GX620 (Small Form Factor) Desktop PC2-5300 Non-ECC DIMM RAM at Amazon.com
parts-quick 4GB Memory Upgrade for Dell Optiplex GX620 GX620n Desktop PC 4 X 1GB DDR2 Non-ECC PC2-4200 240 pin 533MHz DIMM RAM Brand at Amazon.com
Dell Desktop computer Tower Optiplex GX620 2.80GHz 2GB RAM Windows XP PRO sp3... | eBay
Dell OptiPlex GX620 USFF Intel Pentium D 3.0GHz 2GB RAM, DVD-RW, No HD – Hung Tran
Dell Optiplex GX620 Foxconn LS-36 MicroATX LGA 775 Motherboard w/ CPU & 2GB RAM 5704327453338 | eBay
OFFTEK 512MB Replacement Memory RAM Upgrade for Dell OptiPlex GX620 Series (Desktop Mini-Tower and Small Form Factor) (DDR2-4200 - Non-ECC) Desktop Memory at Amazon.com