HP Pro and Elite Desk 400, 600, 800 SFF G3-G5(6) key differences - YouTube
Amazon.com: HP ProDesk 400 G3 Small Form Factor, Intel Core Quad i5 6500 up to 3.6 GHz, 16GB DDR4, 512GB SSD, WiFi, BT 4.0, DVDRW, VGA, DP, Windows 10 Pro 64-Multi-Language Support
Amazon.com: HP ProDesk 400 G6-SFF Core i7-9700 3.0GHz, 32GB RAM, 512GB Solid State Drive, Windows 10 Pro 64Bits, (Renewed) : Electronics
Amazon.com: VCI HP ProDesk 400 G6 Mini, Intel i5-10500T (6 Core), 32GB RAM, 1TB SSD, Business Desktop Computer, Win 10 Pro 64-bit (Win 11 Pro Ready) : Electronics
Amazon.com: HP Prodesk 600 G3 Micro Computer Mini PC (Intel Quad Core i5-7500T 2.7Ghz, 16GB DDR4 Ram, 256GB SSD, Display Port, USB 3.0, USB-C) Win 10 Pro (Renewed) : Electronics
A-Tech 16GB RAM for HP PRODESK 400 G6 SFF | DDR4 2666MHz DIMM PC4-21300 288-Pin Non-ECC UDIMM Memory Upgrade Module at Amazon.com
Amazon.com: HP ProDesk 400 G3 Mini Computers Office Micro Desktop, i5 Tiny Desktop PC WiFi Business, 7500t, 16GB DDR4, 1TB SSD, Built in WiFi+BT, HDMI, Windows 10, Wireless Keyboard and Mouse (Renewed) :