2GB Module Memory for Dell OptiPlex 740 Desktop RAM Memory DDR2 at Amazon.com
Restored Dell Optiplex 780 Windows 10 Home Premium Desktop PC Tower Core 2 Duo 3.0GHz Processor 8GB RAM 500GB Hard Drive DVD-RW Wifi with a 19" LCD- Computer (Refurbished) - Walmart.com
OFFTEK 1GB Replacement Memory RAM Upgrade for Dell OptiPlex 740 (Desktop and Mini-Tower) (DDR2-6400 - Non-ECC) Desktop Memory at Amazon.com