GIGABYTE B840M H Motherboard - AMD Ryzen 9000 CPUs, 5+2+2 Phases VRM, up to 7200MHz DDR5 (OC), 1xPCIe 4.0 M.2, 1GbE LAN, USB 3.2 Gen 1

GIGABYTE B840M H is a Micro ATX motherboard for AMD Socket AM5 processors, built on the AMD B840 chipset. It supports AMD Ryzen 7000, 8000 and 9000 series CPUs, two DDR5 DIMMs up to 128 GB (OC up to 7200 MHz), one PCIe 4.0 x4 M.2 slot, SATA III and PCIe storage with RAID 0/1/5/10 support, and Gigabit Ethernet. The board includes a 5+2+2 phase digital VRM design and user-friendly BIOS/utility features such as multi-theme UI, AIO fan control and Q-Flash auto scan.

Advantages

The Micro ATX form factor offers a compact footprint suitable for smaller desktop builds while retaining key connectivity and expansion options. Support for DDR5 memory and a PCIe 4.0 M.2 slot provides fast system memory and storage performance. The digital 5+2+2 phase VRM improves power delivery stability for compatible AM5 processors. Built-in BIOS and software features simplify system tuning, fan control and firmware updates.

Suitable for

• Compact desktop and small-form-factor PC builds
• Entry to mid-level gaming systems using AMD Ryzen AM5 CPUs
• Home or office productivity and content creation on a compact motherboard

Key specifications

• Form factor: Micro ATX
• Chipset: AMD B840
• Processor socket: AMD Socket AM5 (supports Ryzen 7000/8000/9000 series)
• Memory: 2 × DDR5 DIMM slots, up to 128 GB (OC up to 7200 MHz)
• Storage: 1 × PCIe 4.0 x4 M.2 slot, SATA III ports, RAID 0/1/5/10 support
• Expansion: PCIe slots suitable for discrete graphics and add-in cards
• Audio: 7.1-channel onboard audio (Realtek codec)
• Networking: Gigabit Ethernet
• BIOS: UEFI AMI with Clear CMOS jumper

How to use

Install the motherboard into a compatible Micro ATX case and secure it to standoffs. Fit a compatible AM5 CPU and the recommended CPU cooler, insert up to two DDR5 memory modules following the motherboard manual for dual-channel population, and connect storage devices to the M.2 slot or SATA ports. Attach power connectors from a suitable PSU, connect front-panel connectors, fans and peripherals, and enter the UEFI BIOS to configure memory profiles (EXPO), boot order and fan curves. Use the provided GIGABYTE software or BIOS Q-Flash to update firmware if needed.

Recommendations

For stable performance, use high-quality DDR5 memory modules certified for AM5/EXPO and ensure adequate CPU cooling when overclocking. Keep the BIOS up to date and configure RAID arrays and storage settings in BIOS before installing the operating system.