Dell OptiPlex 755 Desktop Computer, Intel Core 2 Duo Dual-core (2 Core) 2 GHz, 2 GB RAM DDR2 SDRAM, 80 GB HDD, Small Form Factor - Walmart.com
OFFTEK 2GB Replacement Memory RAM Upgrade for Dell OptiPlex 755 Series (Desktop Mini-Tower and Small Form Factor) (DDR2-6400 - Non-ECC) Desktop Memory at Amazon.com
Solved: Optiplex 755 CPU compatibility - Dell Community