Is the Ryzen 9 9950X a good match for the Prime B850-Plus?

Yes. The board's VRM handles the 9950X at stock settings. You lose little versus an X870 board unless you need extra PCIe lanes or USB4.

Do I need a liquid cooler for the 9950X?

A large dual-tower air cooler works for most tasks, but sustained all-core work benefits from a 360mm AIO. The chip targets high temperatures by design.

Does the board support PCIe 5.0?

The main graphics slot is PCIe 5.0. M.2 slots are a mix of Gen 5 and Gen 4 depending on the slot, so check the manual before installing drives.

What memory should I pair with this combo?

Two DDR5 sticks in the preferred slots are the safest choice for high speeds. Four filled slots usually means running at a lower memory speed.

The base Prime B850-Plus is wired Ethernet only. A Wi-Fi version exists, so confirm which model the bundle includes before buying.

Can I overclock the 9950X on this board?

You can adjust PBO and curve optimizer, but the Prime board is not built for aggressive overclocking. Most owners run it at stock or with a mild undervolt.