| Basic Information | ||
| Supported CPU | Supports AMD Ryzen 9000/ 8000/ 7000 Series Desktop Processors Socket AM5 |
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| Chipset | AMD B840 |
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| BIOS | Flash BIOS Button | |
| Form Factor | mATX | |
| Audio | Realtek ALC897 7.1-Channel High Definition Audio |
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| Expansion Slots | ||
| PCI | 1x PCI-E x16 slot 1x PCI-E x1 slot PCI_E1 Gen PCIe 4.0 supports up to x16 (From CPU) PCI_E2 Gen PCIe 3.0 supports up to x1 (From Chipset) PCI_E1 slot • Supports PCIe 4.0 x16 (For Ryzen™ 9000/ 7000 Series processors) • Supports PCIe 4.0 x8 (For Ryzen™ 8700/ 8600/ 8400 Series processors) • Supports PCIe 4.0 x4 (For Ryzen™ 8500/ 8300 Series processors) |
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| M.2 Socket | 2x M.2 M.2_1 Source (From CPU) supports up to PCIe 4.0 x4 , supports 2280/2260 devices M.2_2 Source (From CPU) supports up to PCIe 4.0 x4 , supports 2280/2260 devices 4x SATA 6G M2_2 slot • Supports up to PCIe 4.0 x4 • Supports up to PCIe 4.0 x2 (For Ryzen™ 8500/ 8300 Series processors) |
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| Memory | ||
| Maximum Memory | 128GB | |
| Slots | 2x UDIMM | |
| Supported Memory | Memory Support DDR5 8000 - 5600 (OC) MT/s / 5600 - 4800 (JEDEC) MT/s Ryzen™ 9000 Series Processors max. overclocking frequency: • 1DPC 1R Max speed up to 8000+ MT/s • 1DPC 2R Max speed up to 7200+ MT/s Supports AMD POR Speed and JEDEC Speed Supports Memory Overclocking and AMD EXPOTM Supports Dual-Channel mode Supports Non-ECC, Un-buffered memory Supports CUDIMM, Clock Driver bypass mode only |
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| Type | DDR5 | |
| Graphics | ||
| Graphics | 1x HDMI Support HDMITM 2.1, maximum resolution of 4K 60Hz 1x VGA Support VGA, maximum resolution of 2048x1536 50Hz, 2048x1280 60Hz, 1920x1200 60Hz |
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| Connector & Ports | ||
| HDMI | 1x HDMI | |
| USB (s) | 2x USB 2.0 (Rear) 4x USB 2.0 (Front) 4x USB 5Gbps Type A (Rear) 2x USB 5Gbps Type A (Front) 1x USB 5Gbps Type C (Front) |
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| LAN Port (s) | Realtek 8125D 2.5G LAN | |
| Supported Storage | 2x M.2 M.2_1 Source (From CPU) supports up to PCIe 4.0 x4 , supports 2280/2260 devices M.2_2 Source (From CPU) supports up to PCIe 4.0 x4 , supports 2280/2260 devices 4x SATA 6G M2_2 slot • Supports up to PCIe 4.0 x4 • Supports up to PCIe 4.0 x2 (For Ryzen™ 8500/ 8300 Series processors) |
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| RAID | Supports RAID 0, RAID 1 and RAID 10 for SATA storage devices Supports RAID 0 and RAID 1 for M.2 NVMe storage devices |
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| Audio | 1x Front Audio (JAUD) | |
| Internal I/O Ports | 1x Power Connector(ATX_PWR) 1x Power Connector(CPU_PWR) 1x CPU Fan 2x System Fan 2x Front Panel (JFP) 1x Chassis Intrusion (JCI) 1x Front Audio (JAUD) 1x Com Port (JCOM) 3x Addressable V2 RGB LED connector (JARGB_V2) 1x RGB LED connector(JRGB) 1x TPM pin header(Support TPM 2.0) 4x USB 2.0 ports 2x USB 5Gbps Type A ports 1x USB 5Gbps Type C ports |
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| Display Port (s) | 1x VGA | |
| TPM (Trusted Platform Module ) | 1x TPM pin header(Support TPM 2.0) | |
| Others | ||
| Special Features | 4x EZ Debug LED 1x EZ Memory Detection LED |
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| Warranty Information | ||
| Warranty | 3 Year | |
The MSI PRO B840M-B is a streamlined, highly efficient micro-ATX motherboard built for the AMD AM5 socket. Operating on the mainstream AMD B840 chipset, it offers a reliable, budget-conscious foundation for users assembling essential business workstations, compact home PCs, or entry-level gaming setups. It features native, future-proof support for AMD Ryzen 9000, 8000, and 7000 series desktop processors.
Engineered to deliver rock-solid stability for daily productivity and steady multitasking workloads, the board utilizes a direct 7+2+1 digital power phase design coupled with a solid 8-pin CPU power connector. Built on a premium 6-layer server-grade PCB with thickened copper for superior heat dissipation, the board works hand-in-hand with MSI’s Frozr AI Cooling software. This technology intelligently monitors internal hardware temperatures and automatically scales system fan speeds to optimize overall thermal efficiency.
The PRO B840M-B takes full advantage of high-bandwidth DDR5 memory across two dual-channel UDIMM slots, supporting capacities up to 128GB. Enhanced by MSI's dedicated Memory Boost welding technology and AMD EXPO profiles, it can achieve rapid overclocked memory speeds up to 8000+ MT/s. For storage, it features two high-speed Lightning Gen 4 x4 M.2 slots alongside four SATA 6Gb/s ports, ensuring swift application loading, quick boot times, and flexible NVMe/SATA RAID array options.
Wired connectivity is spearheaded by a fast Realtek 2.5G LAN controller, delivering smooth, low-latency data transfers and stable network performance without needing built-in wireless hardware. The motherboard handles physical components effortlessly with DIY additions like the EZ PCIe Clip II and EZ Debug LEDs. Finally, the rear I/O provides extensive peripheral support, including 5Gbps USB Type-A ports, a front-panel Type-C header, an HDMI 2.1 output for crisp 4K visual displays, and a legacy VGA port for versatile display compatibility.
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