HP Compaq DC7900 SFF Desktop PC - Intel® Core™2 Duo E8400 3.00GHz Processor, 4GB RAM, 320GB HDD, DVD-ROM, Gigabit Ethernet,Windows 10 Pro 64-bit, Gray & Black (Refurbished)- 16-HP-DC7900-SFF-150 at TigerDirect.com
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Refurbished: Refurbished HP Compaq DC7900 SFF Desktop + 17" LCD (Brand my vary) Intel Core 2 Duo E7500 2.93 GHz / 4 GB RAM / 250GB HDD / DVD/ WIFI / Bluetooth
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HP Compaq DC7900 Ultra Slim Desktop PC - Intel Core C2D 2.8GHz, 4GB RAM, 160GB HDD, Intel HD Graphics, Gigabit Ethernet, 8x USB 2.0, Win 10 Pro 64-bit, Refurbished - MOLHPDC7900/2.8C2DU at TigerDirect.com
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HP Compaq DC7900 Small Form Factor - Intel Core 2 Duo E8400 3.0GHz, 4GB RAM, 160GB HDD, DVDROM, Intel GMA 4500, Gigabit Ethernet, Windows 7 Professional, 1 Year Warranty, Refurbished - RB-HPDT00310177 at TigerDirect.com
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CMS 4GB (1X4GB) DDR2 6400 800MHZ NON ECC SODIMM Memory Ram Upgrade Compatible with HP/Compaq® Business Desktop Dc7900 Ultra Slim Desktop - A42 - Walmart.com