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MSI MAG B860M Mortar WiFi specifications and in-depth review

MSI MAG B860M Mortar WiFi

Manufacturer: MSI

The MSI MAG B860M Mortar WiFi is a Micro-ATX motherboard built around the LGA 1851 socket, offering a compact 243.8 × 243.8 mm footprint without sacrificing connectivity or feature depth. It includes built-in Wi-Fi 7 (802.11be) alongside Bluetooth 5.4, RGB lighting, and an easy BIOS reset mechanism, making it a well-rounded option for modern Intel platform builds.

On the memory side, the board accommodates four DDR5 slots with a maximum capacity of 256 GB, running at up to 6400 MHz natively or 9200 MHz with overclocking, across a dual-channel configuration. Expansion is handled by one PCIe 5.0 x16 slot and one PCIe x4 slot, while storage options include three M.2 sockets and four SATA 3 connectors with full RAID 0, 1, 5, and 10 support. The rear I/O provides a Thunderbolt 4 port, a USB 4 40Gbps port, three USB 3.2 Gen 2 Type-A ports, HDMI 2.1, DisplayPort, and a 7.1-channel audio output with S/PDIF.

Pros
  • Supports Wi-Fi 7 alongside all previous Wi-Fi generations down to Wi-Fi 4, providing broad wireless compatibility
  • Includes both a Thunderbolt 4 port and a USB 4 40Gbps port on the rear I/O, offering high-bandwidth connectivity options
  • DDR5 memory can be overclocked up to 9200 MHz across four slots, with a maximum supported capacity of 256 GB
  • Three M.2 sockets combined with four SATA 3 connectors give meaningful flexibility for storage configuration
  • RAID 0, 1, 5, and 10 support enables a variety of storage redundancy and performance setups
  • Carries a 3-year warranty, which is above average for this product category
Cons
  • Micro-ATX form factor limits the total number of expansion slots to one PCIe 5.0 x16 and one PCIe x4, leaving no room for additional full-size cards
  • No PCIe x1 slots are available, restricting the addition of smaller expansion cards
  • ECC memory is not supported, which may matter for users requiring error-correcting RAM
  • Dual BIOS is absent, offering no hardware-level fallback in the event of a corrupted firmware flash
  • No USB 3.2 Gen 1 ports are present on the rear I/O, leaving a gap between USB 2.0 and Gen 2 speeds for Type-A connections
Who is this for?

This board is well-suited to users building a capable Intel LGA 1851 desktop system who want modern wireless connectivity including Wi-Fi 7 without relying on a separate adapter. The four DDR5 slots with overclocking support up to 9200 MHz and a maximum of 256 GB make it a solid fit for memory-intensive workloads, while the Thunderbolt 4 and USB 4 40Gbps ports appeal to users who regularly connect high-bandwidth peripherals or external storage. The Micro-ATX form factor also suits those working with smaller chassis who still want meaningful storage expansion through three M.2 sockets and four SATA 3 connectors, along with RAID 0, 1, 5, and 10 support for those managing multi-drive setups.

Who is this NOT for?

Users who need extensive simultaneous expansion will find the slot count limiting, as the single PCIe 5.0 x16 slot and one PCIe x4 slot leave little room once a primary card is installed, making this a poor fit for multi-GPU or multi-card configurations. The absence of ECC memory support rules it out for workstation or server environments where data integrity under sustained computational loads is a requirement. Additionally, the Micro-ATX size and lack of a dual BIOS mean it is not the right choice for builders who prioritize maximum expandability or want a hardware-level BIOS recovery fallback for extensive overclocking experimentation.

General info:

CPU socket LGA 1851
form factor Micro-ATX
supports Wi-Fi ✓
Wi-Fi version Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac), Wi-Fi 6 (802.11ax), Wi-Fi 6E (802.11ax), Wi-Fi 7 (802.11be)
Has Bluetooth ✓
Bluetooth version 5.4
HDMI version HDMI 2.1
Easy to overclock ✓
has RGB lighting ✓
Easy to reset BIOS ✓
Has dual BIOS ✕
has aptX ✕
CPU sockets 1
Has integrated graphics ✕
warranty period 3 years
height 243.8 mm
width 243.8 mm
Has integrated CPU ✕

The MSI MAG B860M Mortar WiFi is built around a single LGA 1851 CPU socket and uses the Micro-ATX form factor, measuring 243.8 × 243.8 mm. It supports Wi-Fi across multiple generations — from Wi-Fi 4 through to Wi-Fi 7 (802.11be) — and includes Bluetooth 5.4, though aptX is not supported. The board features HDMI 2.1 output, RGB lighting, and a convenient BIOS reset mechanism, while overclocking is noted as straightforward. Dual BIOS is not present, and there is no integrated graphics or integrated CPU. The board carries a 3-year warranty.

Memory:

maximum memory amount 256GB
RAM speed (max) 6400 MHz
overclocked RAM speed 9200 MHz
memory slots 4
DDR memory version 5
memory channels 2
Supports ECC memory ✕

The board features four DDR5 memory slots arranged in a dual-channel configuration, supporting a maximum capacity of 256 GB. Native RAM speeds reach up to 6400 MHz, while overclocking can push that figure to 9200 MHz. ECC memory is not supported.

Ports:

USB 3.2 Gen 2 ports (USB-A) 3
USB 3.2 Gen 1 ports (USB-A) 0
USB 3.2 Gen 2 ports (USB-C) 1
USB 3.2 Gen 1 ports (USB-C) 0
USB 2.0 ports 4
USB 3.2 Gen 2x2 ports 0
USB 4 40Gbps ports 1
USB 4 20Gbps ports 0
Thunderbolt 4 ports 1
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 broad range of connectivity, led by one Thunderbolt 4 port and one USB 4 40Gbps port, both in USB-C form. There is also one USB 3.2 Gen 2 USB-C port alongside three USB 3.2 Gen 2 USB-A ports and four USB 2.0 ports; USB 3.2 Gen 1, Gen 2x2, and USB 4 20Gbps ports are absent. Video output is covered by an HDMI output and one DisplayPort, while VGA, DVI, and eSATA connectors are not included. A single RJ45 port handles wired networking, and there are no PS/2 ports.

Connectors:

USB 3.2 Gen 1 ports (through expansion) 2
USB-C 3.2 Gen 2 ports (through expansion) 1
USB 2.0 ports (through expansion) 4
SATA 3 connectors 4
fan headers 6
USB 3.0 ports (through expansion) 2
M.2 sockets 3
Has TPM connector ✓
U.2 sockets 0
Has mSATA connector ✕
SATA 2 connectors 0

Internal connectivity includes three M.2 sockets and four SATA 3 connectors for storage, while SATA 2 and U.2 sockets are absent, and there is no mSATA connector. USB expansion headers cover two USB 3.2 Gen 1 ports, two USB 3.0 ports, one USB-C 3.2 Gen 2 port, and four USB 2.0 ports. The board also provides six fan headers for cooling management and includes a TPM connector.

Expansion slots:

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

The board provides one PCIe 5.0 x16 slot as the primary expansion slot, suited for a discrete graphics card or similarly demanding add-in card. A second slot is available as a PCIe x4 slot for additional expansion needs. No PCIe 4.0, 3.0, or 2.0 x16 slots are present, and there are no PCIe x1, PCIe x8, or legacy PCI slots.

Audio:

audio channels 7.1
Has S/PDIF Out port ✓
audio connectors 2

Audio support covers a 7.1-channel configuration, with two audio connectors on the rear I/O and an S/PDIF output for digital audio passthrough to external receivers or DACs.

Storage:

Supports RAID 1 ✓
Supports RAID 10 (1+0) ✓
Supports RAID 5 ✓
Supports RAID 0 ✓
Supports RAID 0+1 ✕

The board supports RAID 0, 1, 5, and 10 (1+0) configurations, covering a range of needs from performance striping to redundancy and combined setups. RAID 0+1 is not supported.

Final Verdict

The MSI MAG B860M Mortar WiFi delivers a well-rounded feature set within its Micro-ATX footprint, bringing together Wi-Fi 7, Thunderbolt 4, and DDR5 support with overclocking headroom up to 9200 MHz in a compact package that covers most everyday and enthusiast build requirements on the LGA 1851 platform. Its storage flexibility, broad RAID support, and high-bandwidth rear I/O make it genuinely capable for users who demand more than a basic board, while the three-year warranty adds a layer of long-term assurance. Those requiring ECC memory, extensive multi-card expansion, or a dual BIOS safety net will need to look elsewhere, but for a Micro-ATX build centered on modern connectivity and solid memory performance, this board represents a coherent and well-specified option.

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