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Refurbished: HP Desktop PC Z400 Xeon 2.40 GHz 4GB 250 GB HDD Windows 7 Professional 64-Bit - Newegg.com
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Amazon.com: HP Z400 Workstation with Intel Xeon W3505 2.53GHz 2-Core CPU, 4GB DDR3 RAM, 250GB HDD, Quadro FX1700, Windows 7 Professional Installed : Electronics
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CMS 8GB (2X4GB) DDR3 10600 1333MHZ ECC Non Registered DIMM Memory Ram Compatible with HP/Compaq Workstation Z400 Workstation for Server Only - B80 at Amazon.com
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