My old DDR3 machines needed upgrading, nothing really wrong with them I just needed an excuse to build new ones......
Now I'm not in for the latest and greatest so I didn't go all out since they'll probably be obsolete in about five years.

My Windows Gamer:

Mobo - ASUS Prime X-470 Pro
CPU - AMD Ryzen 7 2700
RAM - G-Skill DDR4-2132 16GB
Storage - NVMe 4x 8.0 GT/s 1000 TB
GPU - Radeon RX 570 (4 GB)
PS - Roswill HIVE 850W Modular
OS - Windows 10 Pro

My Daily Workhorse:

Mobo - ASRock X470 Master SLI/ac
CPU - AMD Ryzen 5 2600
RAM - GSkill 81428 16GB
Storage - NVMe 4x 8.0 GT/s 1000 TB
GPU - GeForce GTX 770
PS - EVGA 750W
OS - Linux Mint 19.3