MSI Pro B550M-P Gen 3 DDR4 AMM Motherboard
MPN MSI-PRO-B550M-P · Brand MSI · mATX
The MSI Pro B550M-P Gen 3 is a Micro-ATX motherboard featuring the AMD B550 chipset, support for AMD Ryzen 5000/3000/4000G processors, four DDR4 slots up to 128 GB, and PCIe 3.0 M.2 storage — a solid foundation for compact professional builds
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Overview
The MSI Pro B550M-P Gen 3 is a Micro-ATX motherboard built on AMD's B550 chipset, designed to pair with AMD Ryzen 5000, 3000, and 4000 G-Series desktop processors in the AM4 socket. Its compact 9.6 x 9.6 inch (24.4 x 24.4 cm) mATX footprint makes it a strong candidate for small-form-factor productivity and home-office builds without sacrificing connectivity or expandability. Memory support is a standout: four DDR4 DIMM slots accommodate up to 128 GB of unbuffered RAM in dual-channel configuration, with JEDEC speeds ranging from DDR4-1866 through DDR4-3200, and A-XMP overclocking profiles pushing supported kits up to 4400 MHz under the right single-DIMM conditions. This headroom suits both everyday multitasking and memory-intensive workloads. Storage versatility is well covered. A single Key-M M.2 slot sourced from the CPU lane runs at PCIe 3.0 x4 speeds and also accepts SATA-based M.2 drives in 2242, 2260, and 2280 form factors. Four SATA 6 Gb/s ports add ample capacity for traditional drives, and RAID 0, 1, and 10 configurations are supported across the SATA array for redundancy or performance. The expansion layout includes one PCIe 3.0 x16 slot (CPU-direct) for a discrete graphics card plus two PCIe 3.0 x1 slots from the chipset, giving builders room for capture cards, sound cards, or networking adapters. Three rear display outputs — VGA, DVI-D, and HDMI 1.4 — are present for systems using processors with integrated graphics. Audio is handled by a Realtek ALC897 codec delivering 7.1-channel HD sound, while networking relies on a Realtek RTL8111H Gigabit LAN controller. Fan management supports one 4-pin CPU header and two 4-pin system fan headers, all controllable through the UEFI BIOS or MSI Center software. EZ Debug LEDs and a 4-pin RGB LED header add basic diagnostic and lighting capability. The board ships with a three-year warranty. Verified Specifications: - Chipset: AMD B550 - CPU Socket: AM4 (Ryzen 5000 / 3000 / 4000 G-Series; excludes Ryzen 5 3400G and Ryzen 3 3200G) - Memory: 4x DDR4 DIMM, max 128 GB, up to DDR4-4400 (OC, 1DPC 1R) - Form Factor: Micro-ATX, 244 mm x 244 mm - M.2: 1x Key-M (PCIe 3.0 x4 / SATA, 2242/2260/2280) - SATA: 4x SATA 6 Gb/s; RAID 0/1/10 - Expansion: 1x PCIe 3.0 x16, 2x PCIe 3.0 x1 - Display: VGA, DVI-D, HDMI 1.4 - Audio: Realtek ALC897, 7.1-CH HD - LAN: Realtek RTL8111H, 1 GbE - BIOS: 256 Mb UEFI AMI - Warranty: 3 Years
Datasheet
| Warranty | 3 Years |
|---|---|
| Form Factor | mATX |
| Chipset | AMD® B550 Chipset |
| CPU Type | Supports AMD RyzenTM 5000 & 3000 Series desktop processors (not compatible with AMD RyzenTM 5 3400G & RyzenTM 3 3200G) and AMD RyzenTM 4000 G-Series desktop processors |
| Lan | 1x Realtek® RTL8111H 1Gbps LAN controller |
| Raid | Supports RAID 0, RAID 1, and RAID 10 for SATA storage devices |
| Audio | Realtek® ALC897 Codec7.1-Channel High Definition Audio |
| Memory | 4x DDR4 memory slots, supporting up to 128GBSupports DDR4 1866/ 2133/ 2400/ 2667/ 2800/ 2933/ 3000/ 3066/ 3200 MHz by JEDECSupports DDR4 2667/ 2800 /2933 /3000 /3066 /3200 /3466 /3600/ 3733 /3866 /4000 /4133 /4266 /4400+ MHz by A-XMP OC MODE1DPC 1R max speed 4400 MHz1DPC 2R max speed 3733 MHz2DPC 1R max speed 3866 MHz2DPC 2R max speed 3466 MHzDual channel memory architectureSupports non-ECC UDIMM memorySupports ECC UDIMM memory (non-ECC mode)Supports un-buffered memory |
| Jumpers | 1x Clear CMOS jumper |
| Software | MSI Center |
| Sata Ports | 4x SATA 6Gb/s ports (From AMD B550 Chipset) |
| Led Features | 1x 4-pin RGB LED connector4x EZ Debug LED |
| Bios Features | 1x 256 Mb flashUEFI AMI BIOSACPI 6.1, SMBIOS 2.8Multi-language |
| M.2 SSD Slots | 1x M.2 slot (Key M)M2_1 slot (From CPU)Supports PCIe 3.0 x4Supports SATA 6Gb/sSupports 2242/ 2260/ 2280 storage devices |
| Expansion Slot | 1x PCIe 3.0 x16 slot (From CPU)2x PCIe 3.0 x1 slots (From AMD B550 chipset) |
| Fan Connectors | 1x 4-pin CPU fan connector2x 4-pin system fan connectors |
| I/O Controller | NUVOTON NCT6795D-M Controller Chip |
| Hardware Monitor | CPU/ System/ Chipset temperature detectionCPU/ System fan speed detectionCPU/ System fan speed control |
| Onboard Graphics | 1x VGA port, supports a maximum resolution of 2048×1536 @50Hz, 2048×1280 @60Hz, 1920×1200 @60Hz1x HDMI 1.4 port, supporting a maximum resolution of 4096×2160 @30Hz, 2560×1600 @60Hz1x DVI-D port, supports a maximum resolution of 1920×1200 @60HzMaximum shared memory of 16 GB |
| Power Connectors | 1x 24-pin ATX main power connector1x 8-pin ATX 12V power connector |
| System Connectors | 1x Front panel audio connector2x System panel connectors1x Chassis Intrusion connector1x Serial port connector1x Parallel port connector1x TPM module connector |
| Back Panel Connectors | Keyboard / MouseVGAUSB 2.0USB 3.2 Gen 1 5GbpsType-ALAN portAudio connectorUSB 2.0DVI-DHDMIUSB 3.2 Gen 1 5Gbps Type-A |
| Internal USB Connectors | 1x USB 3.2 Gen 1 5Gbps connectors (From AMD B550 Chipset)Supports additional 2 USB 3.2 Gen 1 5Gbps ports2x USB 2.0 Type-A connectors (From AMD B550 Chipset)Supports additional 4 USB 2.0 ports |
