MSI PRO B840M‑B is a micro‑ATX board for AMD AM5 Ryzen CPUs, offering dual DDR5 slots with up to 8000 MT/s overclocking, one PCIe 4.0 x16 lane, two M.2 Gen4 drives, HDMI and VGA outputs, SATA III ports, USB 3.0, and a 2.5G Ethernet port for high‑speed networking.