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A-Tech 8GB RAM for HP ProDesk 400 G1 Mini | DDR3 1600MHz PC3-12800 Non ECC SO-DIMM 2Rx8 1.5V - Laptop & Notebook Memory Upgrade Module at Amazon.com
HP ProDesk 400 G2.5 Desktop Computer PC Intel 3.6GHz Processor 500GB HDD 16GB DDR3 RAM, DVD, WIFI, 19in Monitor, T-Wolf TF100 Wireless Keyboard and Mouse - Renewed Windows 10 PC - Walmart.com
HP ProDesk 400 G1 SFF Desktop PC Intel Quad Core I7-4770 3.4Ghz, 16G DDR3, 256G SSD, VGA, DVI, WiFi, Bluetooth, DVDRW, Mouse and Keyboard, Windows 10 Pro 64 Bit Used Grade A - Walmart.com