A-Tech 8GB (4X 2GB) Max Memory RAM Kit for Dell OptiPlex 755, 745, 740, (MT, DT, SFF) - DDR2 667MHz PC2-5300 Non-ECC DIMM Upgrade at Amazon.com
OFFTEK 512MB 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
Restored Dell Desktop Computer Optiplex 755 Intel Core 2 Duo Processor 4GB RAM 250GB HDD DVD 19" LCD Monitor - Windows 10 PC (Refurbished) - Walmart.com
4GB Kit 2 X 2GB DDR2 Memory for Dell Optiplex 755 760 GX280 Ultra Small Form Factor Desktop PC2-6400 240 pin 800MHz Non-ECC DIMM RAM (PARTS-QUICK Brand) at Amazon.com
2GB Memory for Dell OptiPlex 755 DT/MT/SFF/USFF DDR2-800 PC2-6400 Desktop DIMM RAM (PARTS-QUICK Brand) at Amazon.com
Dell Optiplex 755 PC Computer Tower Windows 10 Professional (Win 10) 4GB RAM 250GB
Dell Optiplex 755 PC Computer Tower Windows 10 Professional (Win 10) 4GB RAM 250GB
Beagle Hardware -Dell Optiplex 755
8GB (4 x 2GB) Dell OptiPlex 755 Minitower Desktop Small Form Factor Memory Ram | eBay
Dell Optiplex 755 SFF Intel Core 2 DUO 3.16GHz 2GB RAM 160GB HDD Desktop PC | RecycledGoods.com
Dell Optiplex 755 Desktop Computer, DCNE, Intel Core2 Duo CPU E6550 @2 – Gulf Asset Recovery
4GB 2X2GB Memory RAM for Dell OptiPlex 755 Mini Tower 240pin PC2-5300 667MHz DDR2 DIMM Black Diamond Memory Module Upgrade System Specific Memory - Newegg.com