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Asus Prime B860M-A specifications and in-depth review

Asus Prime B860M-A

Manufacturer: Asus

The Asus Prime B860M-A is a Micro-ATX motherboard designed around Intel's LGA 1851 platform and B860 chipset, offering a compact footprint of 244 mm × 244 mm without sacrificing a well-rounded feature set. It ships with dual BIOS for added resilience during firmware updates, along with a dedicated clear CMOS mechanism that makes BIOS recovery straightforward. RGB lighting is built in, and the board carries a three-year warranty from Asus.

On the memory side, the board provides four DDR5 slots across two channels, supporting up to 256 GB and reaching 8666 MHz when overclocked. Expansion is handled by one PCIe 5.0 x16 slot and one PCIe 4.0 x16 slot, complemented by a single PCIe x1 slot and two M.2 sockets. Rear connectivity includes one USB 3.2 Gen 2 Type-A port, two USB 3.2 Gen 1 Type-A ports, one USB 3.2 Gen 2×2 port, four USB 2.0 ports, an HDMI 2.1 output, two DisplayPort outputs, and a single RJ45 Ethernet jack. Storage options extend to four SATA 3 connectors with full RAID 0, 1, 5, and 10 support, while 7.1-channel audio rounds out the onboard feature set. Wireless connectivity is not included on this model.

Pros
  • Dual BIOS support adds a layer of protection against failed firmware updates
  • Supports RAM overclocking up to 8666 MHz, offering meaningful headroom for memory tuning
  • Includes both a PCIe 5.0 x16 and a PCIe 4.0 x16 slot, providing flexibility for current and recent expansion cards
  • Four RAID modes supported (RAID 0, 1, 5, and 10), giving users solid storage redundancy and configuration options
  • A dedicated clear CMOS mechanism makes BIOS recovery more accessible
  • Three-year warranty period provides extended post-purchase coverage
Cons
  • No Wi-Fi or Bluetooth onboard, requiring a separate adapter for wireless connectivity
  • ECC memory is not supported, limiting suitability for workloads that rely on error-correcting RAM
  • No S/PDIF Out port, which may be a limitation for users connecting to digital audio equipment
  • Only two M.2 sockets available, which may restrict NVMe storage expansion on builds with multiple drives
  • No USB Type-C ports on the rear I/O, despite USB Type-C being present internally
Who is this for?

This motherboard suits builders putting together a compact desktop system who still want access to modern connectivity and storage options. Its Micro-ATX form factor makes it a reasonable fit for space-conscious builds, while support for PCIe 5.0 and DDR5 memory up to 256 GB means it can handle demanding workloads without hitting hardware ceilings too quickly. The inclusion of dual BIOS, easy CMOS reset, and overclock support also makes it a practical choice for users who like to tune their systems, and the broad RAID support (0, 1, 5, and 10) makes it viable for home server or NAS-adjacent setups where storage reliability matters.

Who is this NOT for?

Users who depend on wireless connectivity out of the box will find this board lacking, as neither Wi-Fi nor Bluetooth is included, making it a poor fit for builds in locations where running an Ethernet cable is impractical. It is also not well suited to professional or scientific workloads that require ECC memory for data integrity, since that feature is absent. Additionally, builders planning to run multiple NVMe drives alongside other PCIe devices may find the combination of only two M.2 sockets and a compact slot layout somewhat restrictive for more elaborate storage configurations.

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 244 mm
width 244 mm
Has integrated CPU ✕

The Asus Prime B860M-A is built around the LGA 1851 socket and is compatible with the B860 chipset, housed in a Micro-ATX form factor measuring 244 mm × 244 mm. It supports a single CPU and does not include an integrated processor or onboard graphics. The board features dual BIOS along with an easy CMOS reset option, making firmware management more straightforward. Overclocking is supported, and RGB lighting is present on the board itself. Notably, Wi-Fi and Bluetooth are not included, so wireless connectivity would require a separate adapter. Video output is handled via HDMI 2.1, and the board carries a three-year warranty.

Memory:

maximum memory amount 256GB
overclocked RAM speed 8666 MHz
memory slots 4
DDR memory version 5
memory channels 2
Supports ECC memory ✕

This board offers four DDR5 memory slots arranged across two channels, with a maximum supported capacity of 256 GB. When overclocked, RAM speeds can reach up to 8666 MHz, giving users meaningful headroom for performance tuning. ECC memory is not supported on this motherboard.

Ports:

USB 3.2 Gen 2 ports (USB-A) 1
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 2
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 panel includes a varied USB lineup: one USB 3.2 Gen 2 Type-A port, two USB 3.2 Gen 1 Type-A ports, four USB 2.0 ports, and one USB 3.2 Gen 2×2 port, while USB Type-C is present on the board. USB 4, Thunderbolt 3, and Thunderbolt 4 are not available. For display output, there is one HDMI port and two DisplayPort outputs, with no DVI or VGA connectors present. Network connectivity is provided through a single RJ45 port, and legacy interfaces such as eSATA and PS/2 are absent from this configuration.

Connectors:

USB 3.2 Gen 1 ports (through expansion) 2
USB 3.2 Gen 2 ports (through expansion) 1
USB 2.0 ports (through expansion) 2
SATA 3 connectors 4
fan headers 5
USB 3.0 ports (through expansion) 2
M.2 sockets 2
Has TPM connector ✓
U.2 sockets 0
Has mSATA connector ✕
SATA 2 connectors 0

Internal connectivity is well covered, with expansion headers providing two USB 3.2 Gen 1 ports, one USB 3.2 Gen 2 port, two USB 3.0 ports, and two additional USB 2.0 ports. Storage options include four SATA 3 connectors and two M.2 sockets, while SATA 2, U.2, and mSATA are not present. A TPM connector is included for platform security needs, and five fan headers allow for reasonably flexible cooling configurations.

Expansion slots:

PCIe 4.0 x16 slots 1
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 provides three expansion slots in total: one PCIe 5.0 x16 slot, one PCIe 4.0 x16 slot, and one PCIe x1 slot. Older slot types — including PCIe 3.0 x16, PCIe 2.0 x16, PCIe x4, PCIe x8, and legacy PCI — are not present on this motherboard.

Audio:

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

Onboard audio supports 7.1-channel output and is accompanied by three audio connectors on the rear panel. An S/PDIF Out port is not included on this board.

Storage:

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

The board supports four RAID configurations: RAID 0, RAID 1, RAID 5, and RAID 10, covering a reasonable range of performance and redundancy setups. RAID 0+1 is not supported.

Final Verdict

The Asus Prime B860M-A is a capable Micro-ATX motherboard that delivers a well-rounded feature set for builders working within the LGA 1851 platform. Its support for DDR5 memory, PCIe 5.0, and a broad range of RAID configurations gives it genuine staying power for both general desktop use and light server-oriented builds, while dual BIOS and easy CMOS reset add a layer of practical reliability that more hands-on users will appreciate. The absence of integrated wireless and ECC memory support does narrow its appeal, making it less suitable for certain professional or cable-free environments. That said, for users prioritizing modern storage and memory performance in a compact form factor, the Prime B860M-A represents a solid and well-equipped platform choice.

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