The MSI Pro B850M-X is built around the AM5 socket with B850 chipset compatibility, housed in a Micro-ATX form factor measuring 226 mm × 243.8 mm. It accommodates a single CPU and does not include an integrated processor or integrated graphics. The board supports easy overclocking and features a convenient BIOS reset mechanism, along with RGB lighting for those who want visual customization. Video output is handled through an HDMI 2.1 connection, though the board lacks Wi-Fi and Bluetooth, meaning wireless connectivity requires separate hardware. There is no dual BIOS present, and the unit comes with a 3-year warranty.
The board supports DDR5 memory across two slots arranged in a dual-channel configuration, with a maximum capacity of 128 GB. Standard RAM speeds top out at 5600 MHz, while overclocking headroom extends that figure up to 8200 MHz for users looking to push memory performance further. ECC memory is not supported, making this configuration oriented toward mainstream consumer use rather than workstation or server applications.
The rear I/O panel provides a total of six USB ports: three USB 3.2 Gen 1 Type-A ports, one USB 3.2 Gen 1 Type-C port, and two USB 2.0 ports. Higher-speed USB options such as Gen 2, Gen 2x2, USB 4, Thunderbolt 3, and Thunderbolt 4 are not present. For display output, the board includes both an HDMI port and one DisplayPort output, while VGA, DVI, and eSATA connections are absent. Network connectivity is handled by a single RJ45 Ethernet port, and there are no PS/2 ports included.
Internal connectivity includes four SATA 3 connectors for storage drives alongside a single M.2 socket, while SATA 2, mSATA, and U.2 options are not available. USB expansion headers allow for two USB 3.2 Gen 1 ports, two additional USB 3.0 ports, one USB-C 3.2 Gen 2 port, and four USB 2.0 ports to be added through the chassis, though Gen 2x2 header expansion is absent. The board also features a TPM connector for security module support and four fan headers for cooling management.
The board offers a total of two expansion slots: one PCIe 5.0 x16 slot intended for a primary graphics card or similarly demanding add-in card, and one PCIe x4 slot for additional peripherals. Older slot types — including PCIe 4.0 x16, PCIe 3.0 x16, PCIe 2.0 x16, PCIe x1, PCIe x8, and legacy PCI — are not present, keeping the layout lean within the Micro-ATX footprint.
The onboard audio supports a 7.1-channel configuration, with three analog audio connectors available on the rear panel for speaker and microphone connections. An S/PDIF digital output port is not included.
The board supports RAID 0, RAID 1, and RAID 10 (1+0) configurations, covering the most common setups for performance striping, mirroring, and a combination of both. RAID 5 and RAID 0+1 are not supported.
