8GB 4X2GB Dell OptiPlex 755 Series Desktop/PC DDR2 PC2-5300 RAM Memory at Amazon.com
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
2Gb Memory Ram Upgrade For Dell Optiplex 755 Mini Tower (Ddr2-800Mhz 240-Pin Dimm) - Newegg.com
Terry's Random Ramblings » Dell Optiplex 755 Upgrade Project
Refurbished: Dell Optiplex 755 A Grade Desktop PC with Intel Core 2 Duo 2.66GHz, 4GB RAM, 1TB HDD, DVDRW, Windows 7 Professional 64 Bit, Microsoft Authorized Recertified Desktop PC w/1 Year Warranty - Newegg.com
Optiplex 755, ram - Dell Community
CMS 4GB (2X2GB) DDR2 6400 800MHZ Non ECC DIMM Memory Ram Upgrade Compatible with Dell® Optiplex 755 Dt/Mt/Sff - A90 at Amazon.com
Optiplex 755 USFF cpu and ram upgrade - Dell Community
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