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
Dell Optiplex GX620 MT Intel Pentium 4 2.80GHz CPU 2GB RAM No HDD No OS | eBay
Upgrading Ram in the Dell Optiplex Gx620 - YouTube
Dell Optiplex GX620 MT Intel Pentium 4 3GHz 2GB RAM No HDD No OS | eBay
Solved: Optiplex GX620 memory limitation - Dell Community