Amazon.com: IBM 73P4792 IBM - 4GB PC2-3200 DDR2 SDRAM SGL RANK 73P4792 IBM 4GB 2x2GB 1Rx4 PC2 3200R DDR2 400MHz ECC Reg Memory | "" : Electronics
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
The620Guy Avant AVF6456U61E6800F9 2GB PC2-6400U DDR2 800 CL6 Non-ECC Unbuff Desktop Memory at Amazon.com