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Amazon.com: HP ProOne 400 G2-AIO 20" HD+, Core i5-6500 3.2GHz, 8GB RAM, 480GB Solid State Drive, DVD, Windows 10 Pro 64bit, (RENEWED) : Electronics
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HP ProOne 400 G1 All-in-One Intel Core i5 4590T (2.0 GHz) 4 GB DDR3 500 GB HDD Windows 7 Professional 64-Bit (available through downgrade rights from Windows 8.1 Pro) - Newegg.com
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