Gigabyte B840M D2H

Name: Gigabyte B840M D2H
Brand: Gigabyte
SKU: 2747

Manufacturer: Gigabyte

The Gigabyte B840M D2H is a Micro-ATX motherboard built around the AM5 socket, making it compatible with AMD's current-generation processor lineup. Measuring 244 mm × 244 mm, it fits neatly into compact and mid-size cases alike. The board ships with dual BIOS, offering a built-in layer of protection against failed firmware updates, and supports overclocking through its BIOS settings. It carries a three-year warranty and forgoes RGB lighting, keeping the aesthetic straightforward.

Memory configuration relies on two DDR5 slots capable of holding up to 128 GB across two channels, with a rated maximum of 5200 MHz and overclocked headroom reaching 7200 MHz. Storage is handled by four SATA 3 connectors, two M.2 sockets, and full support for RAID 0, 1, 5, and 10 arrays. The rear panel provides two USB 3.2 Gen 1 Type-A ports, a single RJ45 Ethernet jack, an HDMI 2.1 video output, a PS/2 port, and three audio connectors tied to a 7.1-channel audio codec. Expansion is anchored by one PCIe 4.0 x16 slot alongside a PCIe x4 slot, while internal headers add four USB 2.0 and two USB 3.2 Gen 1 ports through expansion headers.

Pros

Dual BIOS provides a fallback in case of a failed firmware update, adding a layer of reliability
Supports RAID 0, 1, 5, and 10, giving meaningful flexibility for storage redundancy and performance configurations
DDR5 memory with overclocked speeds up to 7200 MHz allows for significant memory bandwidth headroom
Two M.2 sockets alongside four SATA 3 connectors offer a practical range of storage attachment options
7.1-channel audio support covers multi-speaker setups without requiring a dedicated sound card
Backed by a three-year warranty

Cons

No Wi-Fi or Bluetooth means wireless connectivity requires a separate adapter
Only two memory slots limits future upgrade paths and rules out four-module configurations
USB rear panel options are restricted to two USB 3.2 Gen 1 Type-A ports, with no USB-C, USB 4, or higher-speed Gen 2 ports
No PCIe 5.0 x16 slot, leaving only a PCIe 4.0 x16 option for the primary expansion device
S/PDIF digital audio output is absent, limiting connectivity to analog-only audio on the rear panel
No easy CMOS reset button on the board

Who is this for?

This board is well suited to builders assembling a compact AM5-based desktop where space is a consideration but storage flexibility still matters. The combination of two M.2 sockets, four SATA 3 connectors, and support for RAID 0, 1, 5, and 10 makes it a reasonable fit for a small home server or a workstation that needs organized, redundant storage without a full ATX footprint. The dual BIOS and three-year warranty also make it a sensible pick for users who prioritize system stability and want some protection against firmware-related failures. Those who plan to run wired Ethernet and have no need for wireless connectivity will find the feature set adequate for day-to-day use.

Who is this NOT for?

Users who require 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 where running a wired connection is impractical. Enthusiasts looking to maximize memory configuration will be constrained by the two-slot DDR5 layout, which caps physical module count and limits long-term upgrade options. The board is also ill-suited to users who need a broad range of rear USB options, such as content creators or peripheral-heavy setups, given the absence of USB-C, USB 4, and higher-speed Gen 2 ports on the back panel. Those expecting a PCIe 5.0 x16 slot for next-generation expansion devices will similarly find this board inadequate.

General info:

CPU socket	AM5
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 Gigabyte B840M D2H uses the AM5 CPU socket and adopts a Micro-ATX form factor, measuring 244 mm × 244 mm, which suits a range of standard cases. It accommodates a single processor and does not include an integrated CPU or integrated graphics. The board supports overclocking and features dual BIOS for firmware resilience, though it does not offer an easy CMOS reset button. Neither Wi-Fi nor Bluetooth is built in, and the board ships without RGB lighting. Video output is handled through an HDMI 2.1 connector, and the product is backed by a three-year warranty.

Memory:

maximum memory amount	128GB
RAM speed (max)	5200 MHz
overclocked RAM speed	7200 MHz
memory slots	2
DDR memory version	5
memory channels	2
Supports ECC memory	✕

This board supports DDR5 memory across two slots arranged in a dual-channel configuration, with a maximum capacity of 128 GB. The rated memory speed tops out at 5200 MHz, while overclocked profiles can push that figure up to 7200 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	0
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 offers a modest but functional selection of ports. USB connectivity is limited to two USB 3.2 Gen 1 Type-A ports, with no USB 2.0, USB Type-C, USB 4, Thunderbolt, or higher-speed Gen 2 ports present. Video output is provided solely through a single HDMI output, as DisplayPort, DVI, and VGA connectors are all absent. Networking is handled by one RJ45 Ethernet port, and a legacy PS/2 port is also included. eSATA connectivity is not available.

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

Internal connectivity is reasonably well equipped for a board of this class. Storage options include four SATA 3 connectors and two M.2 sockets, while SATA 2 and mSATA are not present, nor are any U.2 sockets. USB expansion headers consist of two USB 3.2 Gen 1 ports, two additional USB 3.0 ports, and four USB 2.0 ports, all routed through internal connectors to the case. The board provides three fan headers for cooling management and includes a TPM connector for 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	0
PCI slots	0
PCIe 2.0 x16 slots	0
PCIe x4 slots	1
PCIe x8 slots	0

Expansion options are kept lean, reflecting the board's Micro-ATX footprint. There is one PCIe 4.0 x16 slot for a primary graphics card or similar full-bandwidth device, complemented by a single PCIe x4 slot for additional cards. No PCIe 5.0 x16, PCIe 3.0 x16, PCIe 2.0 x16, PCIe x8, PCIe x1, or legacy PCI slots are included.

Audio:

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

The board's audio implementation supports 7.1-channel surround sound and provides three analog audio connectors on the rear panel. Digital audio output via S/PDIF is not available.

Storage:

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

The board supports a solid range of RAID configurations, including RAID 0, RAID 1, RAID 5, and RAID 10, covering common needs from performance striping to mirrored redundancy and parity-based arrays. RAID 0+1 is not supported.

Final Verdict

The Gigabyte B840M D2H is a focused Micro-ATX motherboard that delivers a practical AM5 platform for builders who value storage versatility and system reliability over wireless convenience or high-density USB connectivity. Its dual BIOS and broad RAID support give it a dependable foundation for both general desktop use and light storage-oriented workloads, while DDR5 compatibility with overclocked headroom up to 7200 MHz ensures the memory subsystem won't be a bottleneck. The trade-offs — namely the absence of Wi-Fi, Bluetooth, USB-C, and a PCIe 5.0 slot — make it a better match for users with clearly defined, wired-only builds than for those seeking a feature-complete or future-proof platform. Within those boundaries, it represents a coherent and well-specified option for compact AM5 system builds.