Dell Optiplex GX620 Small Form Factor PC Pentium D 3.4GHz 1GB DDR2 RAM – Angel Electronics
CMS 4GB (2X2GB) DDR2 5300 667MHZ Non ECC DIMM Memory Ram Upgrade Compatible with Dell® Optiplex Gx620 Dt/Mt/Sff - A88 at Amazon.com
4AllDeals 1GB Memory RAM Upgrade for The Dell OptiPlex GX620 Desktop, Mini Tower, Small Form Factor and Ultra Small Form Factor (DDR2-400, PC2-3200) at Amazon.com
Dell Optiplex GX620 Small Form Factor PC Pentium D 3.4GHz 1GB DDR2 RAM – Angel Electronics
512MB DDR2 Memory Upgrade for Dell OptiPlex GX620 (Small Form Factor) Desktop PC2-5300 Non-ECC DIMM RAM at Amazon.com