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Refurbished: Dell Optiplex GX520 MT 2GB ram 160 GB HD with Windows 7 Pro 32 Bit - Newegg.ca
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4GB (2x2GB) RAM Memory Compatible with Dell OptiPlex GX520 Series Desktop A86 | eBay
CMS 1GB (1X1GB) DDR2 4200 533MHZ NON ECC DIMM Memory Ram Compatible with Dell Optiplex Gx520 Series Desktop - A99 - Walmart.com
