MSI PRO B840M-B AM5 DDR5 micro-ATX Motherboard

Description

Overview

The MSI PRO B840M-B is a compact AM5 micro‑ATX motherboard designed for mainstream desktop systems using AMD Ryzen™ 7000, 8000 and 9000 series processors. It supports modern features including DDR5 memory, PCIe 4.0 graphics, dual M.2 Gen4 storage and a 2.5G Ethernet interface while maintaining a small mATX footprint for space‑conscious builds.

Key features

• AM5 socket with AMD B840 chipset — compatible with Ryzen™ 7000/8000/9000 series desktop processors.
• Memory: 2× DDR5 UDIMM slots, dual‑channel, up to 128GB (supports JEDEC speeds and higher OC profiles).
• Storage: 2× M.2 Gen4 x4 slots and 4× SATA 6Gb/s ports for NVMe and SATA drives.
• Expansion: 1× PCIe 4.0 x16 (from CPU) and 1× PCIe 3.0 x1 slot.
• Connectivity: Realtek 8125 2.5G LAN, 7× USB 5Gbps (6× Type‑A + 1× Type‑C) and 6× USB 2.0 ports; HDMI 2.1 and VGA display outputs (require a CPU with integrated graphics).
• Onboard conveniences: EZ PCIe Clip II, EZ Debug LED, Clear CMOS and BIOS Flash Button.

Compatibility & notes

• Display outputs only work when the installed CPU provides integrated graphics — check the CPU specifications.
• BIOS updates from MSI may be required for support or improved compatibility for some processors and memory; consult MSI Support before installation.
• This listing is for the motherboard only. Confirm memory, cooler and case compatibility (height/clearance) before purchase.