MSI Pro B840M-B DDR5 AMD Motherboard

The MSI Pro B840M-B DDR5 is a Micro-ATX motherboard built on the AMD B840 chipset, designed for the AM5 platform and compatible with AMD Ryzen 9000, 8000, and 7000 series desktop processors. Its compact 226 mm x 243.84 mm footprint makes it well-suited for space-efficient professional and productivity-focused desktop builds without sacrificing connectivity or expandability. Memory support is a strong point of this board. Two DDR5 UDIMM slots can accommodate up to 128 GB of non-ECC unbuffered memory, with JEDEC speeds ranging from 4800 to 5600 MT/s and overclocked speeds reaching up to 8000+ MT/s (1DPC 1R) on Ryzen 9000 series processors via AMD EXPO and MSI Memory Boost technology. Dual-channel operation is supported, and CUDIMM modules are accepted in clock driver bypass mode. Storage options include two PCIe 4.0 x4 M.2 slots (both sourced from the CPU, supporting 2280 and 2260 devices) and four SATA 6 Gbps ports. RAID configurations—0, 1, and 10 for SATA, and 0 and 1 for NVMe—are available to suit various data redundancy needs. The primary PCIe slot operates at PCIe 4.0 x16 for Ryzen 9000 and 7000 series processors, while a secondary PCIe 3.0 x1 slot is also present. Connectivity is handled by a Realtek 8125D 2.5G LAN controller and Realtek ALC897 7.1-channel HD audio. The rear panel provides HDMI 2.1 (up to 4K 60Hz) and VGA display outputs for processors with integrated graphics, alongside USB 5 Gbps Type-A ports, USB 2.0 ports, and a Flash BIOS Button plus Clear CMOS Button for convenient system management. The front panel header includes a USB 5 Gbps Type-C port and two USB 5 Gbps Type-A ports in addition to four USB 2.0 ports. Power delivery is handled by a 7+2+1 digital power phase VRM design fed by an 8-pin CPU power connector. Safety features include Transient Voltage Suppressors (TVS) on all MSI motherboard models and Overcurrent Protection (OCP) covering USB ports, DDR, PWM IC, and CPU rails. The board also features solid-pin power connectors, an anti-corrosive stainless steel I/O shield, MSI's EZ PCIe Clip II for tool-friendly GPU removal, and EZ Mounting standoff keep-out zones with protective paint around screw holes. Lighting and diagnostics are covered by three Addressable V2 RGB (ARGB V2) headers, one standard RGB header, four EZ Debug LEDs (for CPU, DRAM, VGA, and boot device), and one EZ Memory Detection LED. A TPM 2.0 pin header is included, and the board officially supports Windows 11 64-bit. Key Verified Specifications: - Chipset: AMD B840 - Socket: AM5 - Form Factor: mATX (226 mm x 243.84 mm) - Memory: 2x DDR5 UDIMM, max 128 GB; JEDEC 4800–5600 MT/s; OC up to 8000+ MT/s (Ryzen 9000, 1DPC 1R) - Storage: 2x PCIe 4.0 x4 M.2 (CPU), 4x SATA 6 Gbps - PCIe: 1x PCIe 4.0 x16 (CPU), 1x PCIe 3.0 x1 (Chipset) - Display: HDMI 2.1 (4K 60Hz), VGA (requires iGPU) - LAN: Realtek 8125D 2.5 Gbps - Audio: Realtek ALC897, 7.1-channel HD - USB Rear: 4x USB 5 Gbps Type-A, 2x USB 2.0 - USB Front: 2x USB 5 Gbps Type-A, 1x USB 5 Gbps Type-C, 4x USB 2.0 - VRM: 7+2+1 digital power phases - RGB: 3x ARGB V2, 1x RGB header - OS Support: Windows 11 64-bit