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Gigabyte B860M K specifications and in-depth review

Gigabyte B860M K

Manufacturer: Gigabyte

The Gigabyte B860M K is a Micro-ATX motherboard designed around Intel's LGA 1851 platform and the B860 chipset. It ships without onboard Wi-Fi or Bluetooth, keeping the feature set focused on wired connectivity and core functionality. The board includes dual BIOS, which provides a straightforward recovery path if a firmware update goes wrong, and it supports easy overclocking for users looking to push their CPU performance within the platform's capabilities.

Memory support reaches up to 128GB of DDR5 across two slots in a dual-channel configuration, with standard speeds up to 6400 MHz and overclocked profiles reaching 8800 MHz. Storage options include two M.2 sockets and four SATA 3 connectors, with RAID 0, 1, 5, and 10 all supported. The rear I/O provides four USB 3.2 Gen 1 Type-A ports, two USB 2.0 ports, an HDMI 2.1 output, and a single RJ45 Ethernet port. Expansion is handled by one PCIe 4.0 x16 slot and one PCIe x1 slot, while the board's 7.1-channel audio output is served through three onboard audio connectors.

Pros
  • Dual BIOS provides a reliable fallback if a firmware update fails
  • DDR5 memory support with overclocked speeds reaching up to 8800 MHz offers substantial headroom for memory-intensive workloads
  • Four SATA 3 connectors combined with two M.2 sockets give reasonable storage flexibility for a Micro-ATX board
  • RAID 0, 1, 5, and 10 support allows for both performance and redundancy storage configurations
  • Three-year warranty provides solid long-term coverage
  • 7.1-channel audio output is available through onboard connectors without needing a dedicated sound card
Cons
  • Only two memory slots limits future upgrade paths and rules out four-slot configurations
  • No USB Type-C ports are available on the rear I/O panel
  • Wi-Fi and Bluetooth are absent, requiring a separate adapter for wireless connectivity
  • No quick CMOS reset button, making BIOS recovery less convenient
  • A single PCIe 4.0 x16 slot with no additional x4 or x8 slots restricts multi-card expansion options
  • Only three fan headers may be insufficient for builds with more complex cooling setups
Who is this for?

This board is a reasonable fit for users building a compact desktop system on the LGA 1851 platform who do not require wireless connectivity out of the box. Its support for DDR5 memory with overclocked speeds up to 8800 MHz makes it well-suited for users who want memory performance headroom without stepping up to a higher-tier chipset. The combination of four SATA 3 connectors, two M.2 sockets, and full RAID 0, 1, 5, and 10 support also makes it a practical choice for home or small office setups where basic storage redundancy or performance configurations are desirable within a Micro-ATX footprint.

Who is this NOT for?

Users who rely on wireless connectivity will find this board limiting, as there is no onboard Wi-Fi or Bluetooth, and adding these requires a separate adapter. The board is also a poor fit for those planning to run multiple high-bandwidth expansion cards or peripherals, given that it offers only a single PCIe 4.0 x16 slot with no x4 or x8 alternatives, and provides no USB Type-C ports on the rear I/O. Additionally, builders looking to populate four memory slots or require ECC memory support for workstation-grade reliability will need to look elsewhere, as neither of those configurations is available on this board.

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 215 mm
width 244 mm
Has integrated CPU ✕

The Gigabyte B860M K is built around the LGA 1851 socket and the B860 chipset, housed in a Micro-ATX form factor measuring 244 mm wide and 215 mm tall. It supports easy overclocking and features dual BIOS for added firmware reliability, though it does not offer a quick CMOS reset button. The board provides an HDMI 2.1 video output but lacks integrated graphics and has no integrated CPU. Wireless connectivity is absent, as the board includes neither Wi-Fi nor Bluetooth. There is no RGB lighting on this model, and it carries a three-year warranty.

Memory:

maximum memory amount 128GB
RAM speed (max) 6400 MHz
overclocked RAM speed 8800 MHz
memory slots 2
DDR memory version 5
memory channels 2
Supports ECC memory ✕

The board supports DDR5 memory across two slots in a dual-channel configuration, with a maximum capacity of 128GB. Standard RAM speeds top out at 6400 MHz, while overclocked profiles can reach 8800 MHz for users looking to push memory performance further. ECC memory is not supported on this board.

Ports:

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

The rear I/O panel provides four USB 3.2 Gen 1 Type-A ports and two USB 2.0 ports for peripheral connectivity, while USB Type-C, USB 3.2 Gen 2, USB 4, Thunderbolt 3, and Thunderbolt 4 are all absent. Video output is handled by a single HDMI port, with no DisplayPort, DVI, or VGA options available. Networking is covered by one RJ45 Ethernet port, and a single PS/2 port is present for legacy input devices. There are no eSATA ports on this board.

Connectors:

USB 3.2 Gen 1 ports (through expansion) 2
USB 2.0 ports (through expansion) 4
SATA 3 connectors 4
fan headers 3
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

Storage connectivity is handled by four SATA 3 connectors and two M.2 sockets, with no SATA 2, U.2, or mSATA options present. For USB expansion via internal headers, the board offers two USB 3.2 Gen 1 connectors and four USB 2.0 connectors, alongside two additional USB 3.0 expansion ports. Cooling is managed through three fan headers, and a TPM connector is included for hardware security module support.

Expansion slots:

PCIe 4.0 x16 slots 1
PCIe 5.0 x16 slots 0
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's expansion options are straightforward, offering one PCIe 4.0 x16 slot for a dedicated graphics card or other full-length add-in card, alongside one PCIe x1 slot for smaller expansion cards. There are no PCIe 5.0, PCIe 3.0, PCIe 2.0, PCIe x4, PCIe x8, or legacy PCI slots available.

Audio:

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

The board provides 7.1-channel audio output through three analog audio connectors on the rear I/O. There is no S/PDIF optical output available on this model.

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 configurations, covering a practical range of performance and redundancy setups. RAID 0+1 is not supported.

Final Verdict

The Gigabyte B860M K is a no-frills Micro-ATX motherboard that delivers a focused feature set for builders working within the LGA 1851 platform. Its DDR5 support with overclocked memory speeds up to 8800 MHz, paired with dual BIOS and broad RAID support, gives it enough substance to serve home users and small office builds that prioritize storage flexibility and memory performance over wireless features or extensive expansion. The absence of USB Type-C, onboard Wi-Fi, and a fourth memory slot will be genuine drawbacks for some, but users who can work within those constraints will find a straightforward, reliable board backed by a three-year warranty. Overall, the B860M K is best suited to builders who need a compact, dependable foundation without demanding the full connectivity suite of a higher-tier board.

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