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i found this dell optiplex 755 in a scrap yard perfectly functioning{came with side panel just have it off} its ungodly slow with only a single stick of ddr2 2gb ram and
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Need help for OPTIPLEX 755, Upgrade RAM 1GB - Dell Community
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Dell Optiplex 755 Desktop | Pentium Dual Core - 1.8ghz | 2GB DDR3 Ram | 160GB HDD | Windows 7 Pro - Intelligent Computing
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How to upgrade a DELL OptiPlex 755 USFF PC - YouTube
