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Rectangular ATX motherboard in matte black with silver heatsinks and AM4 socket visible

MSI

MSI B550-A PRO AMD B550 motherboard

SKU CH-0T11-YR601

Socket AM4 ATX board with AMD B550 chipset, dual-channel DDR4 up to 4400 MHz, 128 GB maximum memory, PCIe 4.0 x16 slot, six SATA III ports, Realtek ALC892 7.1 audio and Gigabit LAN

  • CPU Socket TypeSocket AM4
  • CPU TypeSupports AM4 socket 3rd Gen AMD Ryzen processors, and future
  • ChipsetAMD B550
  • Memory StandardSupport dual-channel DDR4 1866/2133/2400/2667/2800/2933/3000
  • Maximum Memory Supported128GB
  • PCI Slots1x PCIe 4.0/ 3.0 x16 slot (PCI_E1) 1x PCIe 3.0 x16 slot (PCI
  • Supports 128GB DDR4 memory for large workloads
  • PCIe 4.0 x16 slot enables modern graphics performance
  • Realtek ALC892 delivers 7.1-channel high-definition audio
  • Gigabit LAN via Realtek 8111H for wired networking
  • Dual-channel DDR4 up to 4400 MHz speeds memory tasks

Socket AM4 platform for Ryzen builders

This MSI B550-A PRO motherboard targets system builders who need a reliable Socket AM4 foundation for 3rd Gen AMD Ryzen processors and future Ryzen CPUs via BIOS update. The AMD B550 chipset delivers mainstream features in a standard ATX layout suitable for everyday computing and gaming rigs.

128 GB DDR4 ceiling with broad frequency support

Dual-channel memory tops out at 128 GB across speeds from 1866 to 4400 MHz, giving ample headroom for multitasking and content creation. Storage connects through two M.2 interfaces and six SATA III ports, while expansion relies on one PCIe 4.0 x16 slot, a second PCIe 3.0 x16 slot running at x4, and two PCIe 3.0 x1 slots.

Minimal bundle keeps the build simple

The package supplies the motherboard, a CMOS battery, one SATA cable and a chassis I/O back panel. A Wi-Fi antenna is included only when the board integrates a Wi-Fi module. No additional cables, software discs or mounting hardware are provided, so builders should plan for any extra connectors their configuration requires.

Points forts

  • Supports 128GB DDR4 memory for large workloads
  • PCIe 4.0 x16 slot enables modern graphics performance
  • Realtek ALC892 delivers 7.1-channel high-definition audio
  • Gigabit LAN via Realtek 8111H for wired networking
  • Dual-channel DDR4 up to 4400 MHz speeds memory tasks

Caractéristiques

BrandMSI
SeriesMSI B550-A PRO
ModelMSI B550-A PRO
CPU Socket TypeSocket AM4
CPU TypeSupports AM4 socket 3rd Gen AMD Ryzen processors, and future AMD Ryzen processors with BIOS update
ChipsetAMD B550
Memory StandardSupport dual-channel DDR4 1866/2133/2400/2667/2800/2933/3000/3066/3200/3466/3600/3733/3866/4000/4133/4266/4400 + MHz memory
Maximum Memory Supported128GB
PCI Slots1x PCIe 4.0/ 3.0 x16 slot (PCI_E1)
1x PCIe 3.0 x16 slot (PCI_E3), supports x4 speed
2x PCIe 3.0 x1 slots
SATA RAID2XM.2 interface, 6xSATA III interface
Audio ChipsetRealtek ALC892 Codec
7.1-Channel High Definition Audio
LAN Chipset1x Realtek 8111H Gigabit LAN controller
Onboard USBAMD B550 Chipset
3x USB 3.2 Gen 1 5Gbps ports (1 Type-C internal connector, and 2 ports are available through the internal USB 3.2 Gen 1 5Gbps connector)
8x USB 2.0 ports (4 Type-A ports on the back panel, 4 ports through the internal USB 2.0 connectors)
AMD Processor
2x USB 3.2 Gen 2 10Gbps ports (1 Type-C port and 1 Type-A port on the back panel)
2x USB 3.2 Gen 1 5Gbps Type-A ports on the back panel

Questions sur cet article

Will my existing DDR4-3200 memory run at its rated speed on this B550 board?

The board supports dual-channel DDR4 speeds from 1866 up to 4400+ MHz, so 3200 MHz modules will operate at their rated frequency when installed in the correct slots.

How can I confirm the Realtek ALC892 audio is functioning after I build the system?

In Windows Device Manager the codec appears as Realtek High Definition Audio with 7.1-channel support; playing a multi-channel test file through the rear panel jacks verifies all channels are active.

Which cables and brackets come in the box, and what must I source myself?

The package includes the motherboard, a CMOS battery, one SATA cable and the chassis I/O back panel; CPU cooler mounting hardware, additional SATA cables, M.2 screws and any Wi-Fi antenna are not supplied.

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