MSI PRO B840M-B AM5 Micro ATX Motherboard
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About This Item
- AMD B840 micro ATX motherboard for Socket AM5
- Supports AMD Ryzen 7000/8000/9000 Series processors
- 2x M.2 slots with PCIe 4.0 support for NVMe SSDs
- 4x SATA III connectors for additional storage
- 2x DDR5 DIMM slots supporting up to 128GB
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MSI PRO B840M-B | AMD B840 Micro ATX Motherboard
The MSI PRO B840M-B motherboard with AMD B840 chipset and Socket AM5 is a micro ATX platform built for professionals who need reliable multitasking and efficient performance. Designed for AMD Ryzen 7000, 8000, and 9000 Series processors, this board supports DDR5 memory and delivers stable power delivery through its 7+2+1 digital VRM design.
Key Specifications
| Metric | Spec. |
|---|---|
| Processor Socket | Socket AM5 |
| Memory Support | DDR5, 2x DIMM slots, up to 128 GB |
| Maximum Memory Speed | 8000 MHz |
| Storage Interfaces | M.2, Micro SATA III |
| USB Ports | 4x USB 3.2 Gen 1, 2x USB 2.0 |
| PCIe Slots | 2x PCIe x16 |
| LAN | 2.5 GbE via Realtek RTL8125D |
| Audio | Realtek ALC897, 7.1 channels |
| Form Factor | micro ATX (226 x 243.8 mm) |
Direct 7+2+1 Power Design for Stable Performance
The PRO B840M-B uses a 7+2+1 digital power phase design to deliver clean, consistent power to your CPU. This architecture helps maintain peak performance during heavy workloads and multitasking, making it ideal for business users and creators who need dependable operation.
Enhanced Cooling for Long-Term Reliability
A chipset heatsink reduces dust build-up and noise while maintaining efficient heat dissipation. Combined with five chassis fan headers and one CPU fan header, the board offers flexible cooling options to keep temperatures in check during extended use.
High-Speed Storage and Connectivity
With two M.2 slots supporting PCIe 4.0 and four SATA III ports, you can install multiple SSDs and HDDs for fast data access. The board supports RAID 0, 1, and 10 configurations, giving you options for speed or redundancy. USB 3.2 Gen 1 ports provide quick connections for peripherals, while the 2.5 GbE LAN ensures low-latency networking.
Box Contents
- MSI PRO B840M-B motherboard
- I/O shield
- User manual
- Driver/software disc
- SATA cables (quantity may vary)
Check Before You Buy
- Confirm your CPU is compatible with Socket AM5 (Ryzen 7000/8000/9000 Series).
- Verify your case supports micro ATX dimensions (226 x 243.8 mm).
- Ensure your power supply has an 8-pin CPU connector.
- Check if your DDR5 memory is on the motherboard’s qualified vendor list.
Frequently Asked Questions
Q: Does this motherboard support integrated graphics?
A: No, the PRO B840M-B does not have on-board graphics. You will need a dedicated GPU.
Q: How many M.2 drives can I install?
A: The board has two M.2 slots, both supporting PCIe 4.0 x4 for high-speed SSDs.
Q: What RAID levels are supported?
A: RAID 0, 1, and 10 are supported via the chipset.
Q: Is Wi-Fi included?
A: No, this model does not include built-in Wi-Fi. You would need a separate Wi-Fi card or adapter.
Q: What is the maximum RAM capacity?
A: The board supports up to 128 GB of DDR5 memory across its two DIMM slots.
The Consultant’s Verdict & Warranty
The MSI PRO B840M-B is a solid choice for professionals and small business users who want a dependable micro ATX platform with modern connectivity and strong power delivery. Its support for the latest Ryzen processors, DDR5 memory, and fast storage makes it future-proof for demanding workloads. Covered by the standard Manufacturer Warranty.
| Internal I/O | |
|---|---|
| Number of M.2 (M) slots | 2 |
| USB 3.2 Gen 2 (3.1 Gen 2) connectors | 1 |
| Total number of SATA connectors | 4 |
| Supported storage drive interfaces | M.2, Micro SATA III |
| USB 2.0 connectors | 4 |
| USB 3.2 Gen 1 (3.1 Gen 1) connectors | 2 |
| Number of SATA III connectors | 4 |
| Number of chassis fan connectors | 5 |
| RGB LED pin header | Yes |
| Number of CPU fan connectors | 1 |
| Number of water pump connectors | 1 |
| Number of RGB LED pin headers | 3 |
| Technical details | |
| Motherboard chipset family | AMD |
| Motherboard chipset | AMD B840 |
| Supported processor sockets | Socket AM5 |
| On-board graphics card | No |
| HDMI version | 2.1 |
| Motherboard form factor | micro ATX |
| Component for | PC |
| Total number of SATA connectors | 4 |
| Audio | |
| Audio output channels | 7.1 channels |
| Performance | |
| Number of HDDs supported | 4 |
| Supported storage drive types | HDD & SSD |
| Windows operating systems supported | Windows 11 x64 |
| Motherboard chipset family | AMD |
| Motherboard chipset | AMD B840 |
| RAID levels | 0, 1, 10 |
| Supported processor sockets | Socket AM5 |
| Audio output channels | 7.1 channels |
| Motherboard form factor | micro ATX |
| Component for | PC |
| Processor | |
| Processor manufacturer | AMD |
| Compatible processor series | AMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series |
| Supported processor sockets | Socket AM5 |
| Processor socket | Socket AM5 |
| Memory | |
| Number of memory slots | 2 |
| Memory slots type | DIMM |
| Supported memory types | DDR5-SDRAM |
| Memory channels | Dual-channel |
| Supported memory clock speeds | 4800,5600,8000 MHz |
| Maximum internal memory | 128 GB |
| Supported memory clock speed (max) | 8000 MHz |
| ECC сompatibility | Non-ECC |
| Storage controllers | |
| Number of HDDs supported | 4 |
| Supported storage drive types | HDD & SSD |
| Supported storage drive interfaces | M.2, Micro SATA III |
| RAID levels | 0, 1, 10 |
| Number of storage drives supported | 6 |
| RAID support | Yes |
| Graphics | |
| On-board graphics card | No |
| Rear panel I/O ports | |
| USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity | 4 |
| USB 2.0 ports quantity | 2 |
| HDMI version | 2.1 |
| HDMI ports quantity | 1 |
| Ethernet LAN (RJ-45) ports | 1 |
| Network | |
| Ethernet LAN | Yes |
| Wi-Fi | No |
| LAN controller | Realtek RTL8125D |
| Ethernet interface type | 2.5 Gigabit Ethernet |
| Features | |
| Windows operating systems supported | Windows 11 x64 |
| Motherboard chipset family | AMD |
| Motherboard chipset | AMD B840 |
| Supported processor sockets | Socket AM5 |
| Audio output channels | 7.1 channels |
| Motherboard form factor | micro ATX |
| Component for | PC |
| Audio chip | Realtek ALC897 |
| Product colour | Black |
| Expansion slots | |
| Number of M.2 (M) slots | 2 |
| PCI Express x16 slots | 2 |
| 1st M.2 largest key size | 2280 |
| 1st M.2 highest PCI Express generation | 4.0 |
| 2nd M.2 largest key size | 2280 |
| 2nd M.2 highest PCI Express generation | 4.0 |
| BIOS | |
| BIOS type | UEFI AMI |
| BIOS memory size | 256 Mbit |
| ACPI version | 6.5 |
| System Management BIOS (SMBIOS) version | 3.7 |
| Software | |
| Windows operating systems supported | Windows 11 x64 |
| Weight & dimensions | |
| Width | 226 mm |
| Depth | 243.8 mm |
| Identifiers | |
| Distributor SKUs | 10459226, 127059, 4711377360166, 911-7E76-002 |
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