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8GB 4X2GB DDR2 667 (PC2 5300) Dell OptiPlex 755 Series Desktop/PC DDR2 PC2-5300 240 PINS RAM Memory - Newegg.com
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4GB (2X2GB) Memory Ram Compatible with Dell Optiplex 755 Dt / Mt / Sff By CMS A90 - Walmart.com - Walmart.com
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Refurbished Dell OptiPlex 755 Tower Desktop Computer with Intel Core 2 Duo Processor, 4GB Memory, 160GB Hard Drive DVD Wi-Fi and Windows 10 PC - Walmart.com
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A-Tech 4GB (2X 2GB) Memory RAM Kit for Dell OptiPlex 755, 745, 740, GX620, GX520, 360, 330, 160, FX160, (MT, DT, SFF, USFF) - DDR2 667MHz PC2-5300 Non-ECC DIMM Modules at Amazon.com
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OptiPlex 755 Desktop Chassis (DT) Removal Guide for the Memory, Heatsink, System Fan and Power Supply | Dell US
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4GB 2X2GB RAM Memory for Dell OptiPlex 755 Desktop DDR2 DIMM 240pin PC2-5300 667MHz Black Diamond Memory Module Upgrade - Newegg.com
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4GB (2X 2GB) Kit DDR2 PC2-6400 RAM Memory Upgrade for Dell Optiplex 160 210L 330 360 740 755 760 960 (PARTS-QUICK) - Walmart.com
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