Used Grade A HP ProDesk 400 G1 SFF Desktop PC, Intel Core I7-4790 3.6Ghz, 16G DDR3, 1T SSD, VGA, DVI, WIFI, BT, DVDRW, Windows 10 Pro 64 Bit - Walmart.com
Memory-Up - Black Diamond Memory
OFFTEK 8GB Replacement Memory RAM Upgrade for HP-Compaq Pavilion Slimline 400-034 (DDR3-10600 - Non-ECC) Desktop Memory at Amazon.com