Placa-mãe MSI B840M GAMING PLUS WIFI6E microATX, Socket AM5, DDR5 até 256 GB, Wi-Fi 6E, 2,5GbE, M.2 x2, HDMI 2.1

The MSI B840M GAMING PLUS WIFI6E is a micro ATX motherboard for Socket AM5 systems, engineered for AMD Ryzen™ 7000 / 8000 / 9000 series processors. It supports DDR5 memory up to 256 GB across four DIMM slots, provides high-speed storage options with multiple M.2 and SATA III ports (RAID 0/1/10), and delivers modern connectivity including Realtek 2.5 Gigabit Ethernet and integrated Wi‑Fi 6E (802.11ax) with Bluetooth 5.3. The board includes an optimized PCB, extended heatsinks and reinforced thermal solutions to maintain stable performance under heavy load while offering EZ DIY features for easier installation.

Advantages

The motherboard combines a 7+2+1 P-PAK digital power design, an 8-pin CPU power connector and a multi-layer PCB with thickened copper to support sustained high-frequency CPU and memory operation. Integrated Wi‑Fi 6E and 2.5G LAN provide low-latency, high-bandwidth networking suitable for gaming and multimedia tasks. Thermal enhancements such as extended heatsinks, MOSFET thermal pads rated 7W/mK, additional choke pads and M.2 Shield Frozr II improve heat dissipation and protect storage drives during prolonged use. EZ M.2 Clip II, EZ PCIe Clip II and EZ Antenna simplify component installation and maintenance.

Suitable for

• Gaming PCs based on AMD Ryzen™ 7000 / 8000 / 9000 series
• Content creation and productivity rigs requiring fast storage and networking
• Compact micro ATX builds that need modern connectivity (Wi‑Fi 6E, 2.5GbE)
• Upgradable systems with DDR5 memory and PCIe 4.0 devices

Key specifications

• Form factor: Micro ATX
• Chipset: AMD B840
• CPU support: Socket AM5 — AMD Ryzen™ 7000 / 8000 / 9000 Series
• Memory: DDR5, 4 DIMM, dual channel, up to 256 GB, support for DDR5 8000+ MT/s (OC)
• Power design: 7+2+1 digital power phases, 8-pin CPU power connector, Core Boost
• Expansion: PCIe 4.0 x16 slot, Lightning Gen4 x4 M.2
• Storage: M.2 (with M.2 Shield Frozr), SATA III ports, RAID 0/1/10 support
• Network: Realtek 2.5 Gigabit Ethernet, Wi‑Fi 6E (802.11ax), Bluetooth 5.3
• Audio: Realtek ALC897, 7.1 channels
• BIOS: UEFI AMI, 256 Mbit
• Supported drives: up to 6 storage drives

How to use

Install the MSI B840M GAMING PLUS WIFI6E into a compatible micro ATX case and connect a Socket AM5 compatible AMD Ryzen processor following standard anti-static procedures. Populate DDR5 memory modules across the DIMM slots for dual-channel operation and install storage devices into M.2 or SATA connectors; enable RAID in UEFI if required. Connect the 8-pin CPU power cable and additional system power connectors, attach front-panel and peripheral headers, and set up the Wi‑Fi antenna. Use the UEFI BIOS to configure memory profiles (XMP/EXPO), boot priorities and fan/thermal controls. Update MSI Center and BIOS as needed for the latest drivers and AI-assisted features.

Recommendations

For stable long-term performance, use quality DDR5 modules matched in pairs for dual-channel operation, ensure adequate case airflow to assist the extended heatsinks and M.2 Shield Frozr, and keep the BIOS and network/Wi‑Fi drivers up to date. When installing high-power CPUs or multiple M.2 SSDs, verify that the 8-pin CPU power connector is securely attached and consider using a case with sufficient cooling to maintain optimal temperatures.