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Restored HP 400 G1-SFF Desktop PC with Intel Core i3-4130 Processor, 4GB Memory, 500GB Hard Drive and Windows 10 Pro (Monitor Not Included) (Refurbished) - Walmart.com
NeweggBusiness - HP Desktop Computer ProDesk 600 G1 Small Form Factor (G5R60UT#ABA) Intel Core i5 4590 (3.30 GHz) 4 GB DDR3 500 GB HDD Intel HD Graphics 4600 Windows 7 Professional with Windows 8.1 Pro upgradable
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HP Prodesk 600 G1 Upgrade RAM & Hard Drive (Disassembly, Replace SSD) - YouTube