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MSI PRO B840M-B , mATX - Supports AMD Ryzen 9000/8000 / 7000 Processors, AM5 - DDR5 , M.2 Gen4, 2.5G LAN
- • AMD B840 Platform: Socket AM5 support for AMD Ryzen 9000, 8000 and 7000 Series desktop processors
- • DDR5 Memory: 2 UDIMM slots, up to 128GB and up to 8000+ MT/s overclocked memory support
- • PCIe & Storage: PCIe 4.0 x16 plus 2 M.2 slots supporting up to PCIe 4.0 x4
- • Networking: Realtek 8125D 2.5G LAN for high-speed wired connectivity
- • Micro-ATX Design: 226 × 243.84 mm with HDMI 2.1, VGA and front USB 5Gbps Type-C support
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- Availability:
- In Stock
- Product Code:
- PRO B840M-B
- Brand:
- MSI
JOD 99.00
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The MSI PRO B840M-B is a Micro-ATX motherboard based on the AMD B840 chipset and Socket AM5, supporting AMD Ryzen 9000, 8000 and 7000 Series desktop processors. It combines two DDR5 memory slots with PCIe 4.0 expansion, dual PCIe 4.0 M.2 storage and a Direct 7+2+1 power system with an 8-pin CPU power connector.
For connectivity and expansion, the motherboard provides Realtek 8125D 2.5G LAN, HDMI 2.1, VGA, front USB 5Gbps Type-C support and four SATA 6G ports. MSI also includes EZ PCIe Clip II, EZ M.2 Clip II, EZ Debug LED, Flash BIOS and Clear CMOS features.
Key Features
- AMD B840 Platform: Socket AM5 support for AMD Ryzen 9000, 8000 and 7000 Series desktop processors.
- DDR5 Memory: Two DDR5 UDIMM slots with up to 128GB capacity and overclocked memory speeds up to 8000+ MT/s.
- PCIe 4.0 Expansion: Primary CPU-connected PCIe x16 slot supports PCIe 4.0 x16 with compatible Ryzen processors.
- Dual M.2 Storage: Two CPU-connected M.2 slots supporting up to PCIe 4.0 x4, plus four SATA 6G ports.
- 2.5G Networking: Realtek 8125D 2.5G LAN provides high-speed wired network connectivity.
- EZ DIY Features: EZ PCIe Clip II, EZ M.2 Clip II, EZ Debug LED, Flash BIOS and Clear CMOS features simplify installation and troubleshooting.
Technical Specifications
| Component | Specification |
| Brand | MSI |
| Model | PRO B840M-B |
| Chipset | AMD B840 |
| CPU Socket | AM5 |
| CPU Support | AMD Ryzen 9000 / 8000 / 7000 Series Desktop Processors |
| Power Design | Direct 7+2+1 Power System with P-PAK |
| CPU Power | 1 × 8-pin CPU power connector |
| Memory Slots | 2 × DDR5 UDIMM |
| Maximum Memory | 128GB |
| Memory Support | DDR5 8000 - 5600 (OC) MT/s / 5600 - 4800 (JEDEC) MT/s |
| Memory Features | AMD EXPO, Dual-Channel, Non-ECC Un-buffered memory, CUDIMM support in Clock Driver bypass mode |
| Expansion Slots | 1 × PCIe x16, 1 × PCIe x1 |
| Primary PCIe Slot | PCIe 4.0 up to x16 from CPU; lane configuration depends on installed processor |
| Additional PCIe Slot | PCIe 3.0 x1 from chipset |
| M.2 Storage | 2 × M.2; up to PCIe 4.0 x4 |
| M.2 Sizes | 2260 / 2280 |
| SATA | 4 × SATA 6G |
| RAID | RAID 0 / 1 / 10 for SATA; RAID 0 / 1 for M.2 NVMe |
| LAN | Realtek 8125D 2.5G LAN |
| Audio | Realtek ALC897, 7.1-Channel High Definition Audio |
| HDMI | 1 × HDMI 2.1, up to 4K 60Hz |
| VGA | 1 × VGA, up to 2048 × 1536 at 50Hz, 2048 × 1280 at 60Hz or 1920 × 1200 at 60Hz |
| Rear USB 5Gbps | 4 × Type-A |
| Rear USB 2.0 | 2 × Type-A |
| Front USB Support | 1 × USB 5Gbps Type-C, 2 × USB 5Gbps Type-A, 4 × USB 2.0 |
| Form Factor | Micro-ATX |
| Dimensions | 226 × 243.84 mm |
| Operating System | Windows 11 64-bit |
Compatibility & Important Information
- The motherboard uses Socket AM5 and supports AMD Ryzen 9000, 8000 and 7000 Series desktop processors.
- The primary PCIe slot supports PCIe 4.0 x16 with Ryzen 9000 and 7000 Series processors, PCIe 4.0 x8 with Ryzen 8700, 8600 and 8400 Series processors, and PCIe 4.0 x4 with Ryzen 8500 and 8300 Series processors.
- M.2_1 supports up to PCIe 4.0 x4. M.2_2 also supports up to PCIe 4.0 x4, but operates at up to PCIe 4.0 x2 with Ryzen 8500 and 8300 Series processors.
- Memory compatibility and supported speeds vary according to the installed processor and memory configuration.
- The HDMI and VGA motherboard video outputs require a processor featuring integrated graphics.
- This model provides wired Realtek 2.5G LAN connectivity.
| Product Specifications | |
|---|---|
| Manufacturers Link | https://www.msi.com/Motherboard/PRO-B840M-B/Specification |
| Motherboard Specifications | |
| CPU Support | AMD Ryzen IX Generation |
| CPU Socket Type | AM5 |
| Chipset | AMD B840 |
| Form Factor | Micro ATX |
| Memory Type | DDR5 |
| Memory Speed | 8000 Mhz |
| Maximum Memory | 128 GB |
| Memory Slots | 2 Slots |
| M.2 Slots | Yes |
| Wireless LAN | No |
| Warranty | |
| Warranty | 1 Year |
Q: Which processors are compatible with the MSI PRO B840M-B?
A: MSI specifies support for AMD Ryzen 9000, 8000 and 7000 Series desktop processors using Socket AM5.
Q: How much DDR5 memory does the motherboard support?
A: It has two DDR5 UDIMM slots with a maximum capacity of 128GB and supports Dual-Channel memory, AMD EXPO and memory overclocking.
Q: What is the maximum specified DDR5 overclocked speed?
A: MSI specifies up to 8000+ MT/s with Ryzen 9000 Series processors using a 1DPC 1R configuration. Supported speeds vary according to the processor and memory configuration.
Q: Does the primary graphics slot support PCIe 5.0?
A: No. MSI specifies the primary CPU-connected slot as PCIe 4.0, operating at up to x16 depending on the installed processor.
Q: How many M.2 SSD slots are available?
A: The motherboard has two M.2 slots. Both support up to PCIe 4.0 x4, although M.2_2 operates at up to PCIe 4.0 x2 with Ryzen 8500 and 8300 Series processors.
Q: How many SATA ports does the motherboard provide?
A: It provides four SATA 6G ports in addition to the two M.2 storage slots.
Q: What wired networking does the MSI PRO B840M-B provide?
A: It uses a Realtek 8125D 2.5G LAN controller.
Q: Do the onboard HDMI and VGA outputs work with every supported processor?
A: No. MSI specifies that the onboard HDMI and VGA outputs require a processor featuring integrated graphics.
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