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MSI Pro B860M-B specifications and in-depth review

MSI Pro B860M-B

Manufacturer: MSI

The MSI Pro B860M-B is a Micro-ATX motherboard designed around Intel's LGA 1851 platform, making it a practical option for builds based on compatible Intel processors. It features dual BIOS support alongside an easy BIOS reset mechanism, which adds a layer of reliability and convenience for users who work with system configurations regularly. RGB lighting is included, and the board carries a three-year warranty from MSI.

On the technical side, the board supports DDR5 memory across two slots, with a maximum capacity of 128GB and standard speeds up to 6400 MHz, extendable to 9066 MHz through overclocking. A single PCIe 5.0 x16 slot handles discrete graphics, while two M.2 sockets and four SATA 3 connectors cover storage needs. The rear I/O includes two USB 3.2 Gen 1 Type-A ports, four USB 2.0 ports, one USB 3.2 Gen 2x2 Type-C port, HDMI 2.1, a DisplayPort output, and a single RJ45 ethernet jack. Audio is handled by a 7.1-channel solution with three connectors. Wi-Fi and Bluetooth are not present on this board.

Pros
  • Dual BIOS support adds a layer of protection against failed updates or corrupted firmware
  • DDR5 memory support with overclocked speeds reaching up to 9066 MHz gives headroom for demanding memory configurations
  • A PCIe 5.0 x16 slot ensures compatibility with the latest generation of discrete graphics cards
  • Two M.2 sockets combined with four SATA 3 connectors offer a reasonable range of storage options for a Micro-ATX board
  • A three-year warranty provides solid long-term coverage
  • The USB 3.2 Gen 2x2 Type-C port on the rear I/O delivers notably fast data transfer speeds
Cons
  • Only two memory slots limit future upgrade flexibility compared to boards with four slots
  • No Wi-Fi or Bluetooth means wireless connectivity requires a separate add-in card
  • The absence of USB 3.2 Gen 2 Type-A ports on the rear I/O leaves faster wired USB-A speeds unavailable
  • With only three fan headers, thermal management options may feel restricted in more demanding builds
  • No S/PDIF Out port limits digital audio output options for users who rely on optical or coaxial connections
Who is this for?

This board suits builders putting together a compact desktop system on the Intel LGA 1851 platform who want a capable foundation without needing a full ATX footprint. The PCIe 5.0 x16 slot makes it a reasonable choice for users pairing a current-generation discrete GPU with their build, while DDR5 support with overclocked speeds up to 9066 MHz appeals to those who want to push memory performance within a Micro-ATX chassis. The dual BIOS and easy BIOS reset features also make it a comfortable fit for users who tinker with settings frequently and value system recovery options without extra hassle.

Who is this NOT for?

Users who need wireless connectivity built in will find this board unsuitable, as there is no Wi-Fi or Bluetooth on board, requiring a separate solution. With only two memory slots, it is a poor fit for those planning extensive RAM upgrades down the line or needing four-slot flexibility for workstation-style configurations. It is also not well-suited for enthusiasts who rely on digital audio output via S/PDIF or those who require a rich rear USB layout with multiple high-speed Type-A ports, given the absence of USB 3.2 Gen 2 Type-A and any USB 4 connectivity.

General info:

CPU socket LGA 1851
chipset B860
form factor Micro-ATX
supports Wi-Fi ✕
Has Bluetooth ✕
HDMI version HDMI 2.1
Easy to overclock ✓
has RGB lighting ✓
Easy to reset BIOS ✓
Has dual BIOS ✓
CPU sockets 1
Has integrated graphics ✕
warranty period 3 years
height 220 mm
width 243.8 mm
Has integrated CPU ✕

The MSI Pro B860M-B is built around the LGA 1851 socket and the B860 chipset, housed in a Micro-ATX form factor measuring 220 mm by 243.8 mm. It supports a single CPU and does not include an integrated CPU or integrated graphics. The board features dual BIOS support along with an easy BIOS reset option, and overclocking is also supported. RGB lighting is present, and an HDMI 2.1 output is available for display connectivity. Wi-Fi and Bluetooth are not included, so wireless connectivity would require additional hardware. The board carries a three-year warranty.

Memory:

maximum memory amount 128GB
RAM speed (max) 6400 MHz
overclocked RAM speed 9066 MHz
memory slots 2
DDR memory version 5
memory channels 2
Supports ECC memory ✕

The board uses DDR5 memory and provides two slots arranged in a dual-channel configuration, supporting a maximum capacity of 128GB. Standard RAM speeds reach up to 6400 MHz, while overclocked configurations can push that figure to 9066 MHz. ECC memory is not supported.

Ports:

USB 3.2 Gen 2 ports (USB-A) 0
USB 3.2 Gen 1 ports (USB-A) 2
USB 3.2 Gen 2 ports (USB-C) 0
USB 3.2 Gen 1 ports (USB-C) 0
USB 2.0 ports 4
USB 3.2 Gen 2x2 ports 1
USB 4 40Gbps ports 0
USB 4 20Gbps ports 0
Thunderbolt 4 ports 0
Thunderbolt 3 ports 0
has an HDMI output ✓
DisplayPort outputs 1
RJ45 ports 1
Has USB Type-C ✓
eSATA ports 0
DVI outputs 0
has a VGA connector ✕
PS/2 ports 0

The rear I/O offers a total of seven USB ports: two USB 3.2 Gen 1 Type-A ports, four USB 2.0 ports, and one USB 3.2 Gen 2x2 Type-C port. There are no USB 4, Thunderbolt, eSATA, or PS/2 ports present. Display output is covered by an HDMI port and one DisplayPort output, while VGA and DVI outputs are absent. Network connectivity is handled by a single RJ45 port.

Connectors:

USB 3.2 Gen 1 ports (through expansion) 2
USB 3.2 Gen 2 ports (through expansion) 0
USB 3.2 Gen 2x2 ports (through expansion) 0
USB-C 3.2 Gen 2 ports (through expansion) 1
USB 2.0 ports (through expansion) 4
SATA 3 connectors 4
fan headers 3
M.2 sockets 2
Has TPM connector ✓
U.2 sockets 0
Has mSATA connector ✕
SATA 2 connectors 0

For internal expansion, the board provides headers that enable two additional USB 3.2 Gen 1 ports, one USB-C 3.2 Gen 2 port, and four USB 2.0 ports. Storage connectivity is covered by four SATA 3 connectors and two M.2 sockets, while SATA 2, U.2, and mSATA connections are not available. A TPM connector is present, and three fan headers are included for cooling management.

Expansion slots:

PCIe 4.0 x16 slots 0
PCIe 5.0 x16 slots 1
PCIe 3.0 x16 slots 0
PCIe x1 slots 1
PCI slots 0
PCIe 2.0 x16 slots 0
PCIe x4 slots 0
PCIe x8 slots 0

The board offers two expansion slots in total: one PCIe 5.0 x16 slot for discrete graphics or high-bandwidth cards, and one PCIe x1 slot for smaller add-in cards. There are no PCIe 4.0, 3.0, or 2.0 x16 slots, and no PCIe x4, x8, or legacy PCI slots are present.

Audio:

audio channels 7.1
Has S/PDIF Out port ✕
audio connectors 3

The board supports 7.1-channel audio and includes three analog audio connectors on the rear I/O. An S/PDIF Out port is not available.

Storage:

Final Verdict

The MSI Pro B860M-B is a focused Micro-ATX motherboard that delivers a well-rounded foundation for Intel LGA 1851 builds where space efficiency matters. Its PCIe 5.0 x16 slot combined with DDR5 support and overclocked memory speeds up to 9066 MHz gives it genuine relevance for users who want modern platform capabilities in a smaller form factor. Practical reliability features like dual BIOS and easy BIOS reset add meaningful peace of mind, though the two-slot memory configuration, absence of built-in wireless, and limited high-speed USB-A options are real constraints that users should weigh against their specific needs. For builders who prioritize a compact, wired setup on a current-generation Intel platform, this board covers the essentials competently.