Asus PRIME H810M-E

This is an Micro-ATX board on the H810M chipset, LGA1851 socket. Memory support covers 2 DDR5 slots up to 128GB total. Expansion includes 2 M.2 slots and 2 PCIe slots. Pick the board for its socket before anything else — chipset niceties come after.

At $113.63 it sits in the budget motherboard bracket. PlanMyPC's builder flags compatibility problems automatically and tracks the latest motherboard deals from multiple stores. 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.