MSI PRO B840M-B AM5 Micro-ATX Motherboard - DDR5 128GB PCIe 4.0 2.5Gb LAN (Boxed)
AM5 micro-ATX motherboard for Ryzen 9000/8000/7000 CPUs. Supports DDR5 up to 128GB (2 slots, 8000+MT/s OC, EXPO), PCIe 4.0 x16, 2x M.2 Gen4, 4x SATA, 2.5Gb LAN, USB-C, Realtek audio, 7+2+1 VRM.
Please Note
The website is currently being actively developed, you are welcome to place the order and in 99% of the cases your order will be processed as usual, but in some cases there may be a delay or the price may change. We will notify you if there are any issues.
Discontinued
This item was discontinued and currently is not available for order on our website. The item may become available soon. Please contact us if you need more information regarding the upcoming arrivals.
| Motherboards - CPU Socket | AMD AM5 |
|---|---|
| Motherboards - Chipset | AMD B840 |
| Motherboards - Form Factor | Micro-ATX |
| Motherboards - Memory Type | DDR5 |
| Motherboards - Memory Profile Support | EXPO |
| Motherboards - Memory Slots | 2 |
| Motherboards - Max Memory Capacity | 128 GB |
| Motherboards - Main Slot PCIe Version | PCIe 4.0 |
| Motherboards - Color | Black |
| Motherboards - M.2 Slots | 2 |
| Motherboards - SATA Ports | 4 |
| Motherboards - USB-C Support | Front Panel Type-C header Rear Type-C |
| Motherboards - RGB Headers | 3-pin 5V ARGB |
| Motherboards - Wireless Connectivity | None |
The MSI PRO B840M-B is a business-oriented micro-ATX motherboard built on the AMD B840 chipset, designed for AMD Ryzen 9000, 8000, and 7000 Series processors with Socket AM5. It features a robust 7+2+1 phase digital power design with an 8-pin CPU connector, Core Boost technology, and 6-layer PCB with 2oz thickened copper for reliable performance under heavy loads.
Memory support includes 2x DDR5 DIMM slots with dual-channel operation up to 128GB capacity and overclocking potential to 8000+ MT/s (1DPC 1R). It supports AMD EXPO profiles, Memory Boost, and High-Efficiency Mode for optimized bandwidth and low latency. Storage options comprise 2x M.2 slots (PCIe 4.0 x4, up to 2280), 4x SATA 6Gb/s ports with RAID 0/1/10 support, plus PCIe 4.0 x16 slot for graphics and expansion.
Connectivity includes 2.5G Realtek RTL8125D LAN, Realtek ALC897 7.1-channel HD audio, rear USB 5Gbps Type-A/C, HDMI 2.1, DisplayPort, and multiple front-panel headers. EZ Debug LEDs, Flash BIOS button, and Frozr design enhance DIY assembly and stability. Ideal for productivity builds and AI-PCs.
- CPU: AMD Ryzen 9000/8000/7000 Series (AM5)
- Memory: 2x DDR5, 128GB max, 8000+ MT/s OC
- Storage: 2x M.2 PCIe 4.0, 4x SATA, RAID 0/1/10
- Network: 2.5Gb LAN
- Form Factor: micro-ATX (226 x 243.84mm)
| Supported CPU Models | AMD Ryzen 9000 / 8000 / 7000 Series |
| Socket | AM5 |
| Chipset | AMD B840 |
| BIOS | 256 Mbit |
| Form Factor | micro ATX (226mm x 243.84mm) |
| Max Memory | 128 GB |
| Memory Slots | 2x DDR5 DIMM |
| Memory Speed | DDR5 8000+ MT/s (OC) / 5600-4800 JEDEC |
| Memory Channels | Dual Channel |
| Memory Type | Non-ECC, Un-buffered DDR5 |
| LAN | Realtek RTL8125D 2.5 Gigabit Ethernet |
| Audio Chip | Realtek ALC897 7.1 CH HD Audio |
| PCIe Slots | 1x PCIe 4.0 x16, others PCIe 4.0/3.0 |
| M.2 Slots | 2 (PCIe 4.0 x4, up to 2280 M-key) |
| SATA Ports | 4x SATA 6Gb/s |
| RAID Support | SATA RAID 0/1/10, M.2 RAID 0/1 |
| VRM Design | 7+2+1 Phase Digital Power (8-pin CPU) |
| USB Rear | USB 5Gbps Type-A/C, USB 2.0 |
| Video Outputs | 1x HDMI 2.1, 1x DisplayPort |
| RGB Headers | Yes (3-pin 5V ARGB) |
| Weight | 1950 g (PCB) |
| Color | Black |