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User manual Dell OptiPlex GX520 (English - 229 pages)
Refurbished: Dell OptiPlex 380 Desktop Computer Core 2 Duo 3.0GHz 8GB DDR3 RAM 500GB HD DVD-RW Microsoft Windows 7 Professional 64-Bit Desktop Computers - Newegg.com
Dell Optiplex GX520 Memory / RAM
Dell Optiplex GX520 Motherboard RJ291 + Intel Pentium D 3GHz CPU + 1GB RAM H8052 - The620Guy.com
Best Buy: Dell Optiplex Desktop Computer 2 GB Memory 40 GB Hard Drive GX520