Asus PRIME B840M-A-CSM

An Micro-ATX board on the B840M chipset, AM5 socket. Expansion covers 2 M.2 slots and 2 PCIe slots. Memory support covers 4 DDR5 slots up to 192GB total. Match the socket to your CPU generation first; chipset features second.

At $169.79 it sits in the mid-range motherboard bracket. Use the PlanMyPC system builder to verify it works alongside your other components and to watch live retailer pricing. Support and warranty service run through ASUS, with terms that vary by region. Scroll down for the complete spec table; the builder's compatibility checker will warn you about any conflicts with components you have already picked.