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How To: Dell Optiplex 755 Ram Upgrade - YouTube
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DELL OPTIPLEX 755 TOWER SFF INTEL CORE 2 DUO 2.0GHz 2GB 250GB WINDOWS XP PRO | eBay
Dell Optiplex 755 DT Intel Core 2 Duo E6550 2.33GHz CPU 2GB RAM No HDD No OS | eBay
Refurbished: Dell Optiplex 755 Small Form Factor Desktop (R2/Ready for Reuse) with Intel Celeron 430@1.80GHz, 2GB RAM, 80GB HD and licensed Windows 7 Home Premium from a Microsoft Authorized Refurbisher - Newegg.com