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
16GB Kit (8x2GB) Fully Buffered DDR2 Server Ram/Memory. PC2-5300 667MHz DDR2 DIMM ECC (Fully Buffered) 240 Pin 1.8V at Amazon.com