Dell OptiPlex 755 Tower Core 2 Duo 3 GHz - HDD 1 TB RAM 4GB | Back Market
CMS 4GB (2X2GB) DDR2 6400 800MHZ NON ECC DIMM Memory Ram Upgrade Compatible with Dell® Optiplex 755 Dt / Mt / Sff - A90 System Specific Memory - Newegg.com
8GB 4X2GB Dell OptiPlex 755 Series Desktop/PC DDR2 PC2-5300 RAM Memory at Amazon.com
OFFTEK 1GB Replacement Memory RAM Upgrade for Dell OptiPlex 755 Series (Desktop Mini-Tower and Small Form Factor) (DDR2-5300 - Non-ECC) Desktop Memory at Amazon.com
8GB (4GBx2) Team High Performance Memory RAM Upgrade For Dell OptiPlex 755 Series (Desktop Mini-Tower and Small Form Factor). The Memory Kit comes with Life Time Warranty. at Amazon.com
Dell Optiplex 755 SFF - Intel Core 2 Duo 2.4GHz - 4GB RAM - 1TB HDD - Win7 - WiFi - DVD-ROM -USED with FREE 3 Year Warranty provided by CPS. - Walmart.com