MSI PRO B550-A PRO AM4 ATX AMD Motherboard - Newegg.com
Amazon.com: MSI B550-A PRO ProSeries Motherboard (AMD AM4, DDR4, PCIe 4.0, SATA 6Gb/s, M.2, USB 3.2 Gen 2, HDMI/DP, ATX) : Electronics
First step in the PCMR ! Ryzen 5 5600x RTX 3070 MSI B550 Pro-VDH Wi-Fi 16 GO Corsair Vengeance Low Profile. Sadly didn't get to build it myself due to GPU shortage.